Eunhyuk and Hyoyeon are best friends. They've been inseperable since childhood. Eunhyuk was always there for Hyoyeon and Hyoyeon was always there for Eunhyuk. When they reach their teenage years they started dating each other. They always fight but ended up kissing each other passionately by the end of the day. Until the unexpected thing happen. On their second year of college, Hyoyeon was happy to see Eunhyuk because they've been busy because of school work. As Hyoyeon walks towards to see Eunhyuk, she saw the unexpected, Eunhyuk was kissing another girl. After seeing the unexpected, she broke up with Eunhyuk and she decided to go to New York. After Eunhyuk found out that she's leaving for New York, Eunhyuk went to see Hyoyeon and begged her not to leave, but Hyoyeon said that she need to get away and that Eunhyuk have to respect that. Hyoyeon left, leaving Eunhyuk devastated. When Hyoyeon left, Eunhyuk became a big playboy. Three years later, Hyoyeon came back and Eunhyuk patiently waits for Hyoyeon in the airport. When Hyoyeon came back, it seems like everything was still the same, except that this time they're not together anymore. Hyoyeon and Eunhyuk was teasing each other and getting upset with one another but like old times, they put the bad things behind them. What happens when old feelings comes back?