Joon-sang is the first love of Yoon-jin. He dies in a traffic accident. Ten years later, while engaged to Sang-hyuk, Yoon-jin meets Min-hyung who looks just like Joon-sang.

In this drama Joon Sang (Bae Yong Jun) voluntarily transfers to a new high school in search for his biological father. Yoo Jin (Choi Ji Woo) and Sang Hyuk (Park Yong Ha) have been good friends since they were children, but Sang Hyuk wants to be more than just her friend. But Yoo Jin falls for the mysterious Joon Sang instead and opens his heart. Just as their love was starting to grow, Joon Sang comes to the startling realization that his dad is not Sang Hyuk's dad, but is Yoo Jin's dad. Get this amazing story and find out what happens next!