A chance encounter makes Jung-hwan remember his first love, Sunny. While stopping to buy some food, he sees a sexy girl that looks exactly like the Sunny he remembers and that brings back a lot of memories and regrets. To his surprise, the girl, Hye-na, turns out to be his upstairs neighbor and Sunny’s daughter. Jung-hwan can’t help but be attracted to her. As they get to know each other, their relationship takes a turn and he will do anything to make it work with his first love’s daughter.