diff --git a/docs/content/v1.0.x-kor/release-notes/_index.md b/docs/content/v1.0.x-kor/release-notes/_index.md
index 8921615e5..a88867a73 100644
--- a/docs/content/v1.0.x-kor/release-notes/_index.md
+++ b/docs/content/v1.0.x-kor/release-notes/_index.md
@@ -10,6 +10,10 @@ sectionStart
 ### v.1.0.15
 Add `ConcreteTypeDefinition` in `ArbitraryProperty`, deprecate `getChildPropertiesByResolvedProperty` and `getChildPropertyListsByCandidateProperty` which is added in 1.0.14.
 
+Add "KotlinDurationIntrospector" supporting generating a Duration type in Kotlin.
+
+Fix setting a child of a concrete type to an abstract type.
+
 sectionEnd
 
 sectionStart
diff --git a/docs/content/v1.0.x/release-notes/_index.md b/docs/content/v1.0.x/release-notes/_index.md
index 6455ee21a..5b2ab579f 100644
--- a/docs/content/v1.0.x/release-notes/_index.md
+++ b/docs/content/v1.0.x/release-notes/_index.md
@@ -12,6 +12,8 @@ Add `ConcreteTypeDefinition` in `ArbitraryProperty`, deprecate `getChildProperti
 
 Add "KotlinDurationIntrospector" supporting generating a Duration type in Kotlin.
 
+Fix setting a child of a concrete type to an abstract type.
+
 sectionEnd
 
 sectionStart
diff --git a/fixture-monkey-tests/kotlin-tests/src/test/kotlin/com/navercorp/fixturemonkey/tests/kotlin/KotlinTest.kt b/fixture-monkey-tests/kotlin-tests/src/test/kotlin/com/navercorp/fixturemonkey/tests/kotlin/KotlinTest.kt
index 916fe0bee..2571ccdc7 100644
--- a/fixture-monkey-tests/kotlin-tests/src/test/kotlin/com/navercorp/fixturemonkey/tests/kotlin/KotlinTest.kt
+++ b/fixture-monkey-tests/kotlin-tests/src/test/kotlin/com/navercorp/fixturemonkey/tests/kotlin/KotlinTest.kt
@@ -30,6 +30,7 @@ import com.navercorp.fixturemonkey.api.introspector.ConstructorPropertiesArbitra
 import com.navercorp.fixturemonkey.api.introspector.FactoryMethodArbitraryIntrospector
 import com.navercorp.fixturemonkey.api.introspector.FailoverIntrospector
 import com.navercorp.fixturemonkey.api.introspector.FieldReflectionArbitraryIntrospector
+import com.navercorp.fixturemonkey.api.plugin.InterfacePlugin
 import com.navercorp.fixturemonkey.api.type.Types.GeneratingWildcardType
 import com.navercorp.fixturemonkey.customizer.Values
 import com.navercorp.fixturemonkey.kotlin.KotlinPlugin
@@ -424,6 +425,32 @@ class KotlinTest {
         then(actual).isNotNull
     }
 
+    @RepeatedTest(TEST_COUNT)
+    fun setConcreteTypeChildReturnsExactlyConcreteTypeChildType() {
+        // given
+        abstract class AbstractClass
+        open class ConcreteType(val parentValue: String) : AbstractClass()
+        class ConcreteTypeChild(val childValue: String) : ConcreteType("parent")
+
+        val sut = FixtureMonkey.builder()
+            .plugin(KotlinPlugin())
+            .plugin(
+                InterfacePlugin()
+                    .abstractClassExtends(
+                        AbstractClass::class.java,
+                        listOf(ConcreteType::class.java, ConcreteTypeChild::class.java)
+                    )
+            )
+            .build()
+
+        // when
+        val actual = sut.giveMeBuilder<AbstractClass>()
+            .set("$", ConcreteTypeChild(""))
+            .sample()
+
+        then(actual).isExactlyInstanceOf(ConcreteTypeChild::class.java)
+    }
+
     companion object {
         private val SUT: FixtureMonkey = FixtureMonkey.builder()
             .plugin(KotlinPlugin())
diff --git a/fixture-monkey/src/main/java/com/navercorp/fixturemonkey/customizer/NodeSetDecomposedValueManipulator.java b/fixture-monkey/src/main/java/com/navercorp/fixturemonkey/customizer/NodeSetDecomposedValueManipulator.java
index 77f7777d2..e080ed6f0 100644
--- a/fixture-monkey/src/main/java/com/navercorp/fixturemonkey/customizer/NodeSetDecomposedValueManipulator.java
+++ b/fixture-monkey/src/main/java/com/navercorp/fixturemonkey/customizer/NodeSetDecomposedValueManipulator.java
@@ -148,21 +148,32 @@ private void setValue(ObjectNode objectNode, @Nullable Object value) {
 			return;
 		}
 
-		ConcreteTypeDefinition concreteTypeDefinition = objectNode.getArbitraryProperty()
-			.getConcreteTypeDefinitions()
-			.stream()
-			.filter(it -> isAssignable(value.getClass(), Types.getActualType(it.getConcreteProperty().getType())))
-			.findFirst()
-			.orElseThrow(() -> new IllegalArgumentException("No resolved property is found."));
-
-		Property resolvedParentProperty = concreteTypeDefinition.getConcreteProperty();
-		objectNode.setResolvedProperty(resolvedParentProperty);
-		List<Property> childProperties = concreteTypeDefinition.getChildPropertyLists();
-		for (ObjectNode child : children) {
-			if (childProperties.contains(child.getProperty())
-				&& resolvedParentProperty.equals(child.getResolvedParentProperty())) {
-				Property childProperty = child.getProperty();
-				setValue(child, childProperty.getValue(value));
+		List<ConcreteTypeDefinition> concreteTypeDefinitions = objectNode.getArbitraryProperty()
+			.getConcreteTypeDefinitions();
+
+		for (ConcreteTypeDefinition concreteTypeDefinition : concreteTypeDefinitions) {
+			Class<?> actualConcreteType = Types.getActualType(concreteTypeDefinition.getConcreteProperty().getType());
+			if (isAssignable(
+				value.getClass(),
+				actualConcreteType
+			)) {
+				Property resolvedParentProperty = concreteTypeDefinition.getConcreteProperty();
+
+				if (isAssignable(
+					actualConcreteType,
+					value.getClass()
+				)) {
+					objectNode.setResolvedProperty(resolvedParentProperty);
+				}
+
+				List<Property> childProperties = concreteTypeDefinition.getChildPropertyLists();
+				for (ObjectNode child : children) {
+					if (childProperties.contains(child.getProperty())
+						&& resolvedParentProperty.equals(child.getResolvedParentProperty())) {
+						Property childProperty = child.getProperty();
+						setValue(child, childProperty.getValue(value));
+					}
+				}
 			}
 		}
 	}