diff --git a/1541_kmk324.cpp b/1541_kmk324.cpp
new file mode 100644
index 0000000..107a510
--- /dev/null
+++ b/1541_kmk324.cpp
@@ -0,0 +1,47 @@
+#include "Derived.h"
+#include "Base.h"
+#include <iostream>
+using namespace std;
+
+int main()
+{
+	cout << "[upcasting Example]" << endl << endl;
+	Base* basePtr = new Base(10, 20);
+	Derived* derPtr = new Derived(30, 50);
+
+	basePtr->printSum();
+	derPtr->printSum();
+
+	basePtr = derPtr;
+	cout << endl << "after upcasting / Derived -> Base.." << endl;
+	basePtr->printSum();
+	derPtr->printSum();
+	/////////////////////////////////////////////////////////////
+
+	cout << endl << "[Downcasting Example1] " << endl << endl;
+	Base* basePtr2 = new Derived(10, 20);
+	Derived* derPtr2 = new Derived(30, 50);
+
+	basePtr2->printSum();
+	derPtr2->printSum();
+
+	derPtr2 = static_cast<Derived*>(basePtr2); //¿Ü¿ì±â
+	cout << endl << "after downcasting / Base -> Derived.." << endl;
+
+	basePtr2->printSum();
+	derPtr2->printSum();
+	
+
+	cout << endl << "[Downcasting Example2]" << endl << endl;
+	Base* basePtr3 = new Base(10, 20);
+	Derived* derPtr3 = new Derived(30, 50);
+
+	cout << endl << "After downcasting Base->Derived...." << endl;
+	derPtr3 =/*static_cast*/(Derived*)(basePtr3); // ???
+	basePtr3->printSum();
+	derPtr3->printSum();
+
+	system("pause");
+	
+	return 0;
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index cd76060..dd824f6 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,6 @@
 - kmk324 
 	- 1530
 		- tip 쉬움.
+	- 1541
+		- tip 
 			
\ No newline at end of file