diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..51f9fd7
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+kuit-ladder
\ No newline at end of file
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000..c2bae49
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" defaultCharsetForPropertiesFiles="UTF-8">
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/git_toolbox_blame.xml b/.idea/git_toolbox_blame.xml
new file mode 100644
index 0000000..7dc1249
--- /dev/null
+++ b/.idea/git_toolbox_blame.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GitToolBoxBlameSettings">
+    <option name="version" value="2" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 2a65317..0f5a2f3 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -4,8 +4,10 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="delegatedBuild" value="false" />
+        <option name="testRunner" value="PLATFORM" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleHome" value="" />
+        <option name="gradleJvm" value="20" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/.idea/material_theme_project_new.xml b/.idea/material_theme_project_new.xml
new file mode 100644
index 0000000..f03833c
--- /dev/null
+++ b/.idea/material_theme_project_new.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MaterialThemeProjectNewConfig">
+    <option name="metadata">
+      <MTProjectMetadataState>
+        <option name="migrated" value="true" />
+        <option name="pristineConfig" value="false" />
+        <option name="userId" value="222f2535:18e61559fdd:-8000" />
+        <option name="version" value="8.13.2" />
+      </MTProjectMetadataState>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 8f86b33..de919f9 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,7 +4,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="homebrew-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_20" project-jdk-name="homebrew-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index 94a25f7..35eb1dd 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="" vcs="Git" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/main/java/DrawConfirm.java b/src/main/java/DrawConfirm.java
new file mode 100644
index 0000000..ab5463f
--- /dev/null
+++ b/src/main/java/DrawConfirm.java
@@ -0,0 +1,37 @@
+public class DrawConfirm {
+
+    private final int[][] rows;
+    private final int row;
+    private final int numberOfPerson;
+
+    public DrawConfirm(int[][] rows, int row, int numberOfPerson) {
+        this.rows = rows;
+        this.row = row;
+        this.numberOfPerson = numberOfPerson;
+    }
+
+    public boolean confirm(int row, int column){
+        //선을 그리는 범위가 벗어나는 것을 방지
+        if (row >= this.row || column >= this.numberOfPerson - 1) {
+            return false;
+        }
+        
+        //선을 그리려는 곳에 이미 선이 있는 상황을 방지
+        if (this.rows[row][column] == 1) {
+            return false;
+        }
+
+        //연속가로선 방지
+        if (column > 0 && rows[row][column - 1] == 1) {
+            return false;
+        }
+        //연속 가로선 방지
+        if (column < this.numberOfPerson - 2 && rows[row][column + 1] == 1) {
+            return false;
+        }
+
+        return true;
+    }
+
+
+}
diff --git a/src/main/java/Ladder.java b/src/main/java/Ladder.java
index 0d2b070..72407fe 100644
--- a/src/main/java/Ladder.java
+++ b/src/main/java/Ladder.java
@@ -1,8 +1,64 @@
 public class Ladder {
 
     private final int[][] rows;
+    private final int numberOfPerson;
+    private final DrawConfirm drawConfirm;
 
-    public Ladder(int row, int numberOfPerson) {
-        rows = new int[row][numberOfPerson];
+    //NaturalNumber를 사용해서 0이상의 값이 입력되도록 설정
+    public Ladder(NaturalNumber row, NaturalNumber numberOfPerson) {
+        this.numberOfPerson = numberOfPerson.getNaturalNumber();
+        rows = new int[row.getNaturalNumber()][numberOfPerson.getNaturalNumber() - 1];
+
+        this.drawConfirm = new DrawConfirm(rows, row.getNaturalNumber(), numberOfPerson.getNaturalNumber());
+    }
+
+    public void drawLine(int row, int position) {
+        if (!this.drawConfirm.confirm(row, position)) {
+            throw new IllegalArgumentException("Cannot Draw Line");
+        }
+
+        rows[row][position] = 1;
     }
+
+    /*private void drawLine(int position) {
+        boolean prevLine = false;
+
+        for (int i = 0; i < numberOfPerson - 1; i++) {
+            if (!prevLine && (Math.random() < 0.5 || i == numberOfPerson - 2)) {
+                rows[position][i] = 1;
+                prevLine = true;
+            } else {
+                rows[position][i] = 0;
+                prevLine = false;
+            }
+        }
+    }*/
+
+    public int run(int startPosition) {
+        StartPositionConfirm(startPosition);
+        int currentPosition = startPosition - 1;
+
+        for (int[] row : rows) {
+            currentPosition = movePosition(currentPosition, row);
+        }
+
+        return currentPosition + 1;
+    }
+
+    private void StartPositionConfirm(int startPosition) {
+        if (startPosition < 1 || startPosition > numberOfPerson) {
+            throw new IllegalArgumentException("Invalid start position");
+        }
+    }
+
+    private int movePosition(int currentPosition, int[] row) {
+        if (currentPosition > 0 && row[currentPosition - 1] == 1) {
+            return currentPosition - 1;
+        }
+        if (currentPosition < numberOfPerson - 1 && row[currentPosition] == 1) {
+            return currentPosition + 1;
+        }
+        return currentPosition;
+    }
+
 }
diff --git a/src/main/java/NaturalNumber.java b/src/main/java/NaturalNumber.java
new file mode 100644
index 0000000..f11c152
--- /dev/null
+++ b/src/main/java/NaturalNumber.java
@@ -0,0 +1,18 @@
+public class NaturalNumber {
+    private int naturalNumber;
+
+    private NaturalNumber(int naturalNumber) {
+        if (naturalNumber < 1) {
+            throw new IllegalArgumentException("Invalid number");
+        }
+        this.naturalNumber = naturalNumber;
+    }
+
+    public static NaturalNumber from(int i) {
+        return new NaturalNumber(i);
+    }
+
+    public int getNaturalNumber() {
+        return naturalNumber;
+    }
+}
diff --git a/src/test/java/LadderTest.java b/src/test/java/LadderTest.java
index 741a915..5d45be9 100644
--- a/src/test/java/LadderTest.java
+++ b/src/test/java/LadderTest.java
@@ -1,5 +1,92 @@
+import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.*;
 
 class LadderTest {
 
+    @Test
+    void 사다리객체_테스트() {
+        // 사다리 객체가 정상적으로 생성되는지 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(4));
+        assertNotNull(ladder);
+    }
+
+    @Test
+    void testDrawLine() {
+        // 선을 정상적으로 그릴 수 있는지, 같은 위치에 중복으로 선을 그릴 수 없는지 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(4));
+        assertDoesNotThrow(() -> ladder.drawLine(0, 0));
+        assertThrows(IllegalArgumentException.class, () -> ladder.drawLine(0, 0));
+    }
+
+    @Test
+    void testDrawLine_OutOfBounds() {
+        // 사다리의 범위를 벗어나는 위치에 선을 그리려 할 때 예외가 발생하는지 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(4));
+        assertThrows(IllegalArgumentException.class, () -> ladder.drawLine(5, 0));
+        assertThrows(IllegalArgumentException.class, () -> ladder.drawLine(0, 3));
+    }
+
+    @Test
+    void 간단한_사다리테스트() {
+        // 사다리 게임을 실행했을 때 예상한 결과가 나오는지 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(4));
+        ladder.drawLine(0, 0);
+        ladder.drawLine(1, 1);
+        ladder.drawLine(2, 2);
+
+        assertEquals(4, ladder.run(1));
+        assertEquals(1, ladder.run(2));
+        assertEquals(2, ladder.run(3));
+        assertEquals(3, ladder.run(4));
+    }
+
+    @Test
+    void 복잡한_사다리테스트() {
+        //더 복잡한 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(6));
+        ladder.drawLine(0, 0);
+        ladder.drawLine(0, 2);
+        ladder.drawLine(0, 4);
+        ladder.drawLine(1, 1);
+        ladder.drawLine(1, 3);
+        ladder.drawLine(2, 0);
+        ladder.drawLine(2, 2);
+        ladder.drawLine(2, 4);
+        ladder.drawLine(3, 1);
+        ladder.drawLine(3, 3);
+        ladder.drawLine(4, 0);
+        ladder.drawLine(4, 2);
+        ladder.drawLine(4, 4);
+
+        assertEquals(6, ladder.run(1));
+        assertEquals(4, ladder.run(2));
+        assertEquals(5, ladder.run(3));
+        assertEquals(2, ladder.run(4));
+        assertEquals(3, ladder.run(5));
+        assertEquals(1, ladder.run(6));
+    }
+
+    @Test
+    void 시작_위치_테스트() {
+        // 유효하지 않은 시작 위치로 게임을 실행하려 할 때 예외가 발생하는지 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(4));
+        assertThrows(IllegalArgumentException.class, () -> ladder.run(0));
+        assertThrows(IllegalArgumentException.class, () -> ladder.run(5));
+    }
+
+    @Test
+    void 가로선_연속_테스트() {
+        // 연속된 가로선을 그리려 할 때 예외가 발생하는지 테스트
+        Ladder ladder = new Ladder(NaturalNumber.from(5), NaturalNumber.from(4));
+        ladder.drawLine(0, 0);
+        assertThrows(IllegalArgumentException.class, () -> ladder.drawLine(0, 1));
+    }
+
+    @Test
+    void testNaturalNumber() {
+        // NaturalNumber 클래스가 올바르게 동작하는지 테스트
+        assertDoesNotThrow(() -> NaturalNumber.from(1));
+        assertThrows(IllegalArgumentException.class, () -> NaturalNumber.from(0));
+        assertThrows(IllegalArgumentException.class, () -> NaturalNumber.from(-1));
+    }
 }
\ No newline at end of file