Sung Hoon (Oh My Venus, Noble My Love) and Song Ji Eun (from the K-pop group Secret) star in a romantic comedy so sweet it's hard to keep it hidden. When a rich heir reunites with the girl whose betrayal changed him forever, their former romance becomes a difficult secret to keep. Cha Jin Wook (Sung Hoon) is a second-generation chaebol. His family owns a large nutritional company. Once, he was a playful guy who thought only of partying. For him, love was a short-term thing. He met a beautiful girl at a Jeju resort. They spent the night together. He fell for her and she left him. He was never the same.