diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..855c0c54
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,18 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4
+trim_trailing_whitespace = true
+
+[*.bat]
+end_of_line = crlf
+
+[*.java]
+indent_style = tab
+ij_java_blank_lines_after_class_header = 1
diff --git a/config/naver-checkstyle-rules.xml b/config/naver-checkstyle-rules.xml
new file mode 100644
index 00000000..dafbb4d1
--- /dev/null
+++ b/config/naver-checkstyle-rules.xml
@@ -0,0 +1,433 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+		"-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+		"http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+
+<!-- Naver coding convention for Java (version 1.2)  -->
+<!-- This rule file requires Checkstyle version 8.24 or above. -->
+
+<!--
+The following rules in the Naver coding convention cannot be checked by this configuration file.
+
+- [avoid-korean-pronounce]
+- [class-noun]
+- [interface-noun-adj]
+- [method-verb-preposition]
+- [space-after-bracket]
+- [space-around-comment]
+-->
+
+<module name = "Checker">
+	<property name="severity" value="warning"/>
+	<property name="fileExtensions" value="java"/>
+
+	<!-- [encoding-utf8] -->
+	<property name="charset" value="UTF-8"/>
+
+	<!-- [newline-lf] -->
+	<module name="RegexpMultiline">
+		<property name="format" value="\r\n"/>
+		<property name="message" value="[newline-lf] Line must end with LF, not CRLF"/>
+	</module>
+
+
+	<!-- [newline-eof] -->
+	<module name="NewlineAtEndOfFile">
+		<property name="lineSeparator" value="lf"/>
+	</module>
+
+	<!-- [no-trailing-spaces] -->
+	<module name="RegexpSingleline">
+		<property name="format" value="^(?!\s+\* $).*?\s+$"/>
+		<property name="message" value="[no-trailing-spaces] Line has trailing spaces."/>
+	</module>
+
+	<!-- [line-length-120] -->
+	<property name="tabWidth" value="4"/>
+	<module name="LineLength">
+		<property name="max" value="120"/>
+		<property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+		<message key="maxLineLen"
+				 value="[line-length-120] Line is longer than {0,number,integer} characters (found {1,number,integer})"/>
+	</module>
+
+	<module name="TreeWalker">
+		<!-- Start of Naming chapter -->
+
+		<!-- [list-uppercase-abbr] -->
+		<module name="AbbreviationAsWordInName">
+			<property name="ignoreFinal" value="false"/>
+			<property name="allowedAbbreviationLength" value="1"/>
+			<message key="abbreviation.as.word"
+					 value="[list-uppercase-abbr] Abbreviation in name ''{0}'' must contain no more than {1}"/>
+			<property name="allowedAbbreviations" value="DAO,BO"/>
+		</module>
+
+		<!-- [package-lowercase] -->
+		<module name="PackageName">
+			<property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+			<message key="name.invalidPattern"
+					 value="[package-lowercase] Package name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+
+
+		<!-- [class-interface-lower-camelcase] -->
+		<module name="TypeName">
+			<message key="name.invalidPattern"
+					 value="[class-interface-lower-camelcase] Type name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+
+		<!-- [method-lower-camelcase] -->
+		<module name="MethodName">
+			<property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
+			<message key="name.invalidPattern"
+					 value="[method-lower-camelcase] Method name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+
+		<!-- [var-lower-camelcase] -->
+		<module name="MemberName">
+			<property name="format" value="^[a-z][a-zA-Z0-9][a-zA-Z0-9]*$"/>
+			<message key="name.invalidPattern"
+					 value="[var-lower-camelcase] Member name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+		<module name="ParameterName">
+			<property name="format" value="^[a-z][a-zA-Z0-9][a-zA-Z0-9]*$"/>
+			<message key="name.invalidPattern"
+					 value="[var-lower-camelcase] Parameter name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+
+		<!-- [var-lower-camelcase], [avoid-1-char-var] -->
+		<module name="LocalVariableName">
+			<property name="tokens" value="VARIABLE_DEF"/>
+			<property name="format" value="^[a-z][a-zA-Z0-9][a-zA-Z0-9]*$"/>
+			<property name="allowOneCharVarInForLoop" value="true"/>
+			<message key="name.invalidPattern"
+					 value="[var-lower-camelcase][avoid-1-char-var] Local variable name ''{0}'' must match pattern ''{1}''."/>
+		</module>
+
+		<!-- End of Naming chapter -->
+
+		<!-- Start of Declarations chapter -->
+
+		<!-- [1-top-level-class] -->
+		<module name="OneTopLevelClass"/>
+		<message key="name.invalidPattern"
+				 value="[1-top-level-class] one.top.level.class=Top-level class {0} has to reside in its own source file."/>
+
+		<!-- [avoid-star-import] -->
+		<module name="AvoidStarImport">
+			<property name="allowStaticMemberImports" value="true"/>
+			<message key="import.avoidStar"
+					 value="[avoid-star-import] Using the ''.*'' form of import should be avoided - {0}."/>
+		</module>
+
+		<!-- [modifier-order] -->
+		<module name="ModifierOrder">
+			<message key="mod.order"
+					 value="[modifier-order] ''{0}'' modifier out of order with the JLS suggestions."/>
+			<message key="annotation.order"
+					 value="[modifier-order] ''{0}'' annotation modifier does not precede non-annotation modifiers."/>
+		</module>
+
+		<!-- [newline-after-annotation] -->
+		<module name="AnnotationLocation">
+			<property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF"/>
+			<property name="allowSamelineSingleParameterlessAnnotation" value="true"/>
+			<message key="annotation.location.alone"
+					 value="[newline-after-annotation] Annotation ''{0}'' should be alone on line."/>
+		</module>
+
+		<!-- [1-state-per-line] -->
+		<module name="OneStatementPerLine">
+			<message key="needBraces"
+					 value="[1-state-per-line] Only one statement per line allowed."/>
+		</module>
+
+		<!-- [1-var-per-declaration] -->
+		<module name="MultipleVariableDeclarations">
+			<message key="multiple.variable.declarations"
+					 value="[1-var-per-declaration] Only one variable definition per line allowed."/>
+			<message key="multiple.variable.declarations.comma"
+					 value="[1-var-per-declaration] Each variable declaration must be in its own statement."/>
+		</module>
+
+		<!-- [array-square-after-type] -->
+		<module name="ArrayTypeStyle">
+			<message key="array.type.style"
+					 value="[array-square-after-type] Array brackets at illegal position."/>
+		</module>
+
+		<!-- [long-value-suffix] -->
+		<module name="UpperEll">
+			<message key="upperEll" value="[long-value-suffix] Should use uppercase ''L''."/>
+		</module>
+
+		<!-- [special-escape] -->
+		<module name="IllegalTokenText">
+			<property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>
+			<property name="format" value="\\u00(08|09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)"/>
+			<property name="message" value="[array-square-after-type]  Avoid using corresponding octal or Unicode escape."/>
+		</module>
+
+		<!-- End of Declarations chapter -->
+
+		<!-- Start of Indentation chapter -->
+
+		<!-- [4-spaces-tab] -->
+		<property name="tabWidth" value="4"/>
+
+		<!-- [indentation-tab] -->
+		<module name="RegexpSinglelineJava">
+			<property name="format" value="^\t* "/>
+			<property name="message" value="[indentation-tab] Indent must use tab characters"/>
+			<property name="ignoreComments" value="true"/>
+		</module>
+
+		<!-- End of Indentation chapter -->
+
+		<!-- Start of Braces chapter -->
+
+		<!-- [braces-knr-style]-->
+		<module name="LeftCurly">
+			<message key="line.break.after"
+					 value="[braces-knr-style] ''{0}'' at column {1} should have line break after."/>
+			<message key="line.new"
+					 value="[braces-knr-style] ''{0}'' at column {1} should be on a new line."/>
+			<message key="line.previous"
+					 value="[braces-knr-style] ''{0}'' at column {1} should be on the previous line."/>
+		</module>
+		<module name="RightCurly">
+			<property name="option" value="alone"/>
+			<property name="tokens" value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT, INSTANCE_INIT"/>
+			<message key="line.alone"
+					 value="[braces-knr-style] ''{0}'' at column {1} should be alone on a line."/>
+			<message key="line.break.before"
+					 value="[braces-knr-style] =''{0}'' at column {1} should have line break before."/>
+			<message key="line.new"
+					 value="[braces-knr-style] ''{0}'' at column {1} should be on a new line."/>
+		</module>
+
+		<!-- [sub-flow-after-brace] -->
+		<module name="RightCurly">
+			<property name="option" value="same"/>
+			<property name="tokens" value="LITERAL_TRY, LITERAL_CATCH, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_DO"/>
+			<message key="line.same"
+					 value="[sub-flow-after-brace] ''{0}'' at column {1} should be on the same line as the next part of a multi-block statement (one that directly contains multiple blocks: if/else-if/else or try/catch/finally)."/>
+			<message key="line.break.before"
+					 value="[sub-flow-after-brace] ''{0}'' at column {1} should have line break before."/>
+		</module>
+
+		<!-- [need-braces] -->
+		<module name="NeedBraces">
+			<message key="needBraces"
+					 value="[need-braces] ''{0}'' statement must use '''{}'''s."/>
+		</module>
+
+		<!-- End of Braces chapter -->
+
+		<!-- Start of Line-wrapping chapter -->
+
+		<!-- [1-line-package-import]-->
+		<module name="NoLineWrap">
+			<property name="tokens" value="PACKAGE_DEF, IMPORT"/>
+			<message key="no.line.wrap"
+					 value="[1-line-package-import] {0} statement should not be line-wrapped."/>
+		</module>
+
+		<!-- [block-indentation][indentation-after-line-wrapping] -->
+		<!-- checkstyle 6.16 이상을 써야지 탭을 쓸때의 인덴트 체크가 제대로 동작함 -->
+		<module name="Indentation">
+			<property name="basicOffset" value="4"/>
+			<property name="braceAdjustment" value="0"/>
+			<property name="caseIndent" value="4"/>
+			<property name="throwsIndent" value="4"/>
+			<property name="lineWrappingIndentation" value="4"/>
+			<property name="arrayInitIndent" value="4"/>
+		</module>
+
+		<!-- [line-wrapping-position] -->
+		<module name="SeparatorWrap">
+			<property name="tokens" value="COMMA"/>
+			<property name="option" value="EOL"/>
+			<message key="line.previous"
+					 value="[line-wrapping-position] ''{0}'' should be on the previous line."/>
+		</module>
+		<module name="SeparatorWrap">
+			<property name="tokens" value="DOT"/>
+			<property name="option" value="NL"/>
+			<message key="line.new"
+					 value="[line-wrapping-position] ''{0}'' should be on a new line."/>
+		</module>
+		<module name="OperatorWrap">
+			<property name="option" value="NL"/>
+			<property name="tokens" value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR, LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR "/>
+			<message key="line.new"
+					 value="[line-wrapping-position] ''{0}'' should be on a new line."/>
+		</module>
+
+		<!-- End of Line-wrapping chapter -->
+
+		<!-- Start of Blank lines chapter -->
+
+		<!-- [blankline-after-package] -->
+		<!--
+		This module always requires an empty line between header and package.
+		But it is not forced in the Naver guide.
+		See https://github.com/checkstyle/checkstyle/issues/1035
+		<module name="EmptyLineSeparator">
+			<property name="tokens" value="PACKAGE_DEF"/>
+			<message key="empty.line.separator"
+				value="[blankline-after-package] ''{0}'' should be separated from previous statement."/>
+		</module>
+		-->
+
+		<!-- [import-grouping] -->
+		<module name="ImportOrder">
+			<property name="groups" value="java., javax., org., net., /com\.(?!nhncorp|navercorp|naver)/, /(?!java\.|javax\.|com\.|org\.|net\.)/, com.nhncorp., com.navercorp., com.naver."/>
+			<property name="ordered" value="true"/>
+			<property name="separated" value="true"/>
+			<property name="option" value="top"/>
+			<property name="sortStaticImportsAlphabetically" value="true"/>
+			<message key="import.groups.separated.internally"
+					 value="[import-grouping] Extra separation in import group before ''{0}''"/>
+			<message key="import.ordering"
+					 value="[import-grouping] Wrong order for ''{0}'' import."/>
+			<message key="import.separation"
+					 value="[import-grouping] ''{0}'' should be separated from previous imports."/>
+		</module>
+
+		<!-- [blankline-between-methods] -->
+		<module name="EmptyLineSeparator">
+			<property name="tokens" value="METHOD_DEF"/>
+			<message key="empty.line.separator"
+					 value="[blankline-between-methods] ''{0}'' should be separated from previous statement."/>
+		</module>
+
+		<!-- End of Blank lines chapter -->
+
+		<!-- Start of Whitespace chapter -->
+
+		<!-- [space-around-brace] -->
+		<module name="WhitespaceAround">
+			<property name="allowEmptyConstructors" value="true"/> <!-- [permit-concise-empty-block] -->
+			<property name="allowEmptyMethods" value="true"/>  <!-- [permit-concise-empty-block] -->
+			<property name="allowEmptyLoops" value="true"/>  <!-- [permit-concise-empty-block] -->
+			<property name="tokens" value="LCURLY, RCURLY, SLIST"/>
+			<message key="ws.notFollowed"
+					 value="[space-around-brace] ''{0}'' is not followed by whitespace."/>
+			<message key="ws.notPreceded"
+					 value="[space-around-brace] ''{0}'' is not preceded with whitespace."/>
+		</module>
+
+		<!-- [space-between-keyword-parentheses] -->
+		<module name="WhitespaceAround">
+			<property name="tokens" value="
+				DO_WHILE, LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN,
+			 	LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE,"
+			/>
+			<message key="ws.notFollowed"
+					 value="[space-between-keyword-parentheses] ''{0}'' is not followed by whitespace."/>
+			<message key="ws.notPreceded"
+					 value="[space-between-keyword-parentheses] ''{0}'' is not preceded with whitespace."/>
+		</module>
+
+		<!-- [no-space-between-identifier-parentheses] -->
+		<module name="MethodParamPad">
+			<message key="line.previous"
+					 value="[no-space-between-identifier-parentheses] ''{0}'' should be on the previous line."/>
+			<message key="ws.preceded"
+					 value="[no-space-between-identifier-parentheses] ''{0}'' is preceded with whitespace."/>
+		</module>
+
+		<!-- [no-space-typecasting] -->
+		<module name="TypecastParenPad">
+			<property name="tokens" value="RPAREN,TYPECAST"/>
+			<message key="ws.followed"
+					 value="[no-space-typecasting] ''{0}'' is followed by whitespace."/>
+			<message key="ws.preceded"
+					 value="[no-space-typecasting] ''{0}'' is preceded with whitespace."/>
+		</module>
+
+		<!-- [generic-whitespace] -->
+		<module name="GenericWhitespace">
+			<message key="ws.followed"
+					 value="[generic-whitespace] ''{0}'' is followed by whitespace."/>
+			<message key="ws.preceded"
+					 value="[generic-whitespace] ''{0}'' is preceded with whitespace."/>
+			<message key="ws.illegalFollow"
+					 value="[generic-whitespace] ''{0}'' should followed by whitespace."/>
+			<message key="ws.notPreceded"
+					 value="[generic-whitespace] ''{0}'' is not preceded with whitespace."/>
+		</module>
+
+		<!-- [space-after-comma-semicolon] -->
+		<module name="WhitespaceAfter">
+			<property name="tokens" value="COMMA,SEMI"/>
+			<message key="ws.notFollowed"
+					 value="[space-after-comma-semicolon]: ''{0}'' is not followed by whitespace."/>
+		</module>
+		<module name="NoWhitespaceBefore">
+			<property name="tokens" value="COMMA,SEMI"/>
+			<message key="ws.preceded"
+					 value="[space-after-comma-semicolon] ''{0}'' is preceded with whitespace."/>
+		</module>
+
+		<!-- [space-around-colon] -->
+		<module name="WhitespaceAround">
+			<property name="tokens" value="COLON"/>
+			<property name="ignoreEnhancedForColon" value="false"/>
+			<message key="ws.notFollowed"
+					 value="[space-around-colon] ''{0}'' is not followed by whitespace."/>
+			<message key="ws.notPreceded"
+					 value="[space-around-colon] ''{0}'' is not preceded with whitespace."/>
+		</module>
+
+		<!-- [no-space-unary-operator] -->
+		<module name="NoWhitespaceBefore">
+			<property name="tokens" value="POST_INC, POST_DEC"/>
+			<message key="ws.preceded"
+					 value="[no-space-unary-operator] ''{0}'' is preceded with whitespace."/>
+		</module>
+		<module name="NoWhitespaceAfter">
+			<property name="tokens" value="INC, DEC, UNARY_MINUS, UNARY_PLUS, BNOT, LNOT"/>
+			<message key="ws.followed"
+					 value="[no-space-unary-operator] whitespace ''{0}'' is followed by whitespace."/>
+		</module>
+
+		<!-- [space-around-binary-ternary-operator] -->
+		<module name="WhitespaceAround">
+			<property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, DIV,
+				 DIV_ASSIGN, EQUAL, GE, GT, LAND, LE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL,
+				 PLUS, PLUS_ASSIGN, QUESTION, SL, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, TYPE_EXTENSION_AND"/>
+			<message key="ws.notFollowed"
+					 value="[space-around-binary-ternary-operator] ''{0}'' is not followed by whitespace."/>
+			<message key="ws.notPreceded"
+					 value="[space-around-binary-ternary-operator] ''{0}'' is not preceded with whitespace."/>
+		</module>
+
+		<!-- End of Whitespace chapter -->
+
+		<!--- Suppression -->
+		<module name="SuppressionCommentFilter">
+			<property name="offCommentFormat" value="@checkstyle:off"/>
+			<property name="onCommentFormat" value="@checkstyle:on"/>
+		</module>
+		<module name="SuppressWithNearbyCommentFilter">
+			<property name="commentFormat" value="@checkstyle:ignore"/>
+			<property name="checkFormat" value=".*"/>
+			<property name="influenceFormat" value="0"/>
+		</module>
+	</module>
+
+	<!--- Suppression -->
+	<module name="SuppressionFilter">
+		<property name="file" value="${suppressionFile}"/>
+		<property name="optional" value="true"/>
+	</module>
+
+	<!--- Exclude module-info.java -->
+	<module name="BeforeExecutionExclusionFileFilter">
+		<property name="fileNamePattern" value="module\-info\.java$"/>
+	</module>
+
+</module>