“Do you know me?” A simple question was enough to change the trajectory of Lee Ha-kyung’s life. Seven years ago, Ha-kyung was struggling to support his family when he was approached by a man with an offer: assume the identity of Han Jiyoung, a girl from his past, for the summer and deceive the chairman of Taewon Group into believing he was really her, and he'd never have to worry about money again. All goes according to plan, until the chairman’s grandson, Yoonsung, shows up. One summer spent together forms a seemingly unbreakable bond between the two - and memories that should have lasted forever...