diff --git a/refactoring/src/main/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/Person.java b/refactoring/src/main/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/Person.java
new file mode 100644
index 00000000..178827ed
--- /dev/null
+++ b/refactoring/src/main/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/Person.java
@@ -0,0 +1,24 @@
+package com.example.refactoring._06_mutable_data._20_remove_setting_method;
+
+public class Person {
+
+    private String name;
+
+    private final int id;
+
+    public Person(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+}
diff --git a/refactoring/src/main/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/before/Person.java b/refactoring/src/main/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/before/Person.java
new file mode 100644
index 00000000..7846da53
--- /dev/null
+++ b/refactoring/src/main/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/before/Person.java
@@ -0,0 +1,24 @@
+package com.example.refactoring._06_mutable_data._20_remove_setting_method.before;
+
+public class Person {
+
+    private String name;
+
+    private int id;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+}
diff --git a/refactoring/src/test/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/PersonTest.java b/refactoring/src/test/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/PersonTest.java
new file mode 100644
index 00000000..b2a79042
--- /dev/null
+++ b/refactoring/src/test/java/com/example/refactoring/_06_mutable_data/_20_remove_setting_method/PersonTest.java
@@ -0,0 +1,19 @@
+package com.example.refactoring._06_mutable_data._20_remove_setting_method;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PersonTest {
+
+    @Test
+    void person() {
+        Person person = new Person(10);
+
+        person.setName("john");
+        assertEquals(10, person.getId());
+        assertEquals("john", person.getName());
+        person.setName("jane");
+        assertEquals("jane", person.getName());
+    }
+}
\ No newline at end of file