diff --git a/docs/content/v1.0.x/release-notes/_index.md b/docs/content/v1.0.x/release-notes/_index.md
index 7d624b5054..7c188d218f 100644
--- a/docs/content/v1.0.x/release-notes/_index.md
+++ b/docs/content/v1.0.x/release-notes/_index.md
@@ -8,6 +8,8 @@ weight: 100
 ### v1.0.9
 Fix addExceptGenerateClass option affected by specific ArbitraryIntrospector
 
+Add customizing Wildcard type in an option
+
 ##### Experimental Feature
 Add `customizeProperty` API in `ArbitraryBuilder` to customize a generated value.
 
diff --git a/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptions.java b/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptions.java
index c37cea3e30..0bafa78e66 100644
--- a/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptions.java
+++ b/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptions.java
@@ -42,6 +42,7 @@
 import org.apiguardian.api.API;
 import org.apiguardian.api.API.Status;
 
+import com.navercorp.fixturemonkey.api.arbitrary.CombinableArbitrary;
 import com.navercorp.fixturemonkey.api.constraint.JavaConstraintGenerator;
 import com.navercorp.fixturemonkey.api.container.DecomposedContainerValueFactory;
 import com.navercorp.fixturemonkey.api.generator.ArbitraryContainerInfoGenerator;
@@ -62,6 +63,7 @@
 import com.navercorp.fixturemonkey.api.generator.StreamContainerPropertyGenerator;
 import com.navercorp.fixturemonkey.api.instantiator.InstantiatorProcessor;
 import com.navercorp.fixturemonkey.api.introspector.ArbitraryIntrospector;
+import com.navercorp.fixturemonkey.api.introspector.ArbitraryIntrospectorResult;
 import com.navercorp.fixturemonkey.api.introspector.NullArbitraryIntrospector;
 import com.navercorp.fixturemonkey.api.matcher.AssignableTypeMatcher;
 import com.navercorp.fixturemonkey.api.matcher.DoubleGenericTypeMatcher;
@@ -73,6 +75,7 @@
 import com.navercorp.fixturemonkey.api.property.PropertyGenerator;
 import com.navercorp.fixturemonkey.api.property.PropertyNameResolver;
 import com.navercorp.fixturemonkey.api.type.Types;
+import com.navercorp.fixturemonkey.api.type.Types.GeneratedWildcardType;
 import com.navercorp.fixturemonkey.api.type.Types.UnidentifiableType;
 import com.navercorp.fixturemonkey.api.validator.ArbitraryValidator;
 
@@ -84,8 +87,12 @@ public final class FixtureMonkeyOptions {
 	public static final List<MatcherOperator<ContainerPropertyGenerator>> DEFAULT_CONTAINER_PROPERTY_GENERATORS =
 		getDefaultContainerPropertyGenerators();
 	public static final List<MatcherOperator<ArbitraryIntrospector>> DEFAULT_ARBITRARY_INTROSPECTORS =
-		Collections.singletonList(
-			MatcherOperator.exactTypeMatchOperator(UnidentifiableType.class, NullArbitraryIntrospector.INSTANCE)
+		Arrays.asList(
+			MatcherOperator.exactTypeMatchOperator(UnidentifiableType.class, NullArbitraryIntrospector.INSTANCE),
+			MatcherOperator.exactTypeMatchOperator(
+				GeneratedWildcardType.class,
+				context -> new ArbitraryIntrospectorResult(CombinableArbitrary.from(new Object()))
+			)
 		);
 	public static final ObjectPropertyGenerator DEFAULT_OBJECT_PROPERTY_GENERATOR =
 		DefaultObjectPropertyGenerator.INSTANCE;
diff --git a/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptionsBuilder.java b/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptionsBuilder.java
index 03465c8071..aaf1a5c6d9 100644
--- a/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptionsBuilder.java
+++ b/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/option/FixtureMonkeyOptionsBuilder.java
@@ -98,7 +98,7 @@ public final class FixtureMonkeyOptionsBuilder {
 	private ArbitraryContainerInfoGenerator defaultArbitraryContainerInfoGenerator;
 	private ArbitraryGenerator defaultArbitraryGenerator;
 	private UnaryOperator<ArbitraryGenerator> defaultArbitraryGeneratorOperator = it -> it;
-	private final List<MatcherOperator<ArbitraryIntrospector>> arbitraryIntrospectors =
+	private List<MatcherOperator<ArbitraryIntrospector>> arbitraryIntrospectors =
 		new ArrayList<>(DEFAULT_ARBITRARY_INTROSPECTORS);
 	private final JavaDefaultArbitraryGeneratorBuilder javaDefaultArbitraryGeneratorBuilder =
 		IntrospectedArbitraryGenerator.javaBuilder();
@@ -367,7 +367,7 @@ public FixtureMonkeyOptionsBuilder defaultArbitraryContainerInfoGenerator(
 	public FixtureMonkeyOptionsBuilder insertFirstArbitraryIntrospector(
 		MatcherOperator<ArbitraryIntrospector> arbitraryIntrospector
 	) {
-		this.arbitraryIntrospectors.add(arbitraryIntrospector);
+		this.arbitraryIntrospectors = insertFirst(this.arbitraryIntrospectors, arbitraryIntrospector);
 		return this;
 	}
 
diff --git a/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/type/Types.java b/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/type/Types.java
index cf9dc5715d..fa54bd5875 100644
--- a/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/type/Types.java
+++ b/fixture-monkey-api/src/main/java/com/navercorp/fixturemonkey/api/type/Types.java
@@ -91,6 +91,9 @@ public static Class<?> getActualType(AnnotatedType annotatedType) {
 
 	public static Class<?> getActualType(Type type) {
 		if (type.getClass() == Class.class) {
+			if (type == Object.class) {
+				return GeneratedWildcardType.class;
+			}
 			return (Class<?>)type;
 		}
 
@@ -397,6 +400,11 @@ private UnidentifiableType() {
 		}
 	}
 
+	public static class GeneratedWildcardType {
+		private GeneratedWildcardType() {
+		}
+	}
+
 	public static Class<?> primitiveToWrapper(final Class<?> cls) {
 		Class<?> convertedClass = cls;
 		if (cls != null && cls.isPrimitive()) {
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 361a5762bf..5d50ac2bd0 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
@@ -19,11 +19,14 @@
 package com.navercorp.fixturemonkey.tests.kotlin
 
 import com.navercorp.fixturemonkey.FixtureMonkey
+import com.navercorp.fixturemonkey.api.arbitrary.CombinableArbitrary
 import com.navercorp.fixturemonkey.api.experimental.JavaGetterMethodPropertySelector.javaGetter
 import com.navercorp.fixturemonkey.api.experimental.TypedExpressionGenerator.typedRoot
+import com.navercorp.fixturemonkey.api.introspector.ArbitraryIntrospectorResult
 import com.navercorp.fixturemonkey.api.introspector.ConstructorPropertiesArbitraryIntrospector
 import com.navercorp.fixturemonkey.api.introspector.FactoryMethodArbitraryIntrospector
 import com.navercorp.fixturemonkey.api.introspector.FailoverIntrospector
+import com.navercorp.fixturemonkey.api.type.Types.GeneratedWildcardType
 import com.navercorp.fixturemonkey.kotlin.KotlinPlugin
 import com.navercorp.fixturemonkey.kotlin.get
 import com.navercorp.fixturemonkey.kotlin.giveMeBuilder
@@ -244,6 +247,34 @@ class KotlinTest {
         then(actual).isBetween(min, max)
     }
 
+    @RepeatedTest(TEST_COUNT)
+    fun sampleCustomizedWildcardType() {
+        // given
+        class MapObject(val map: Map<String, *>)
+
+        val expected = "test"
+
+        val sut = FixtureMonkey.builder()
+            .plugin(KotlinPlugin())
+            .pushExactTypeArbitraryIntrospector<GeneratedWildcardType> {
+                ArbitraryIntrospectorResult(
+                    CombinableArbitrary.from(expected)
+                )
+            }
+            .build()
+
+        // when
+        val actual = sut.giveMeBuilder<MapObject>()
+            .sizeExp(MapObject::map, 1)
+            .sample()
+            .map
+            .values
+            .first()
+
+        // then
+        then(actual).isEqualTo(expected)
+    }
+
     companion object {
         private val SUT: FixtureMonkey = FixtureMonkey.builder()
             .plugin(KotlinPlugin())