A clique of six friends separate after their graduation from college: Hye-jin continues to pursue her tertiary education, Seon-ae moves to the United States, Jung-wook works as a lawyer, Se-hun opens an art studio while preparing for his directorial debut, Mi-ryeong becomes an actress, and Hyun-jun is stuck as a construction worker due to the cast on his leg. Seon-ae returns home and tells Hye-jin and Se-hun about the deceased Kyung-ah pursuing her. Back when they were in college, the clique decided to include a new member, Eun-ju, whom Hye-jin befriended at a botanical garden. Hyun-jun fell in love with her at first sight, much to the disappointment of Seon-ae, who was in love with him. Seon-ae made Eun-ju a scapegoat for the misfortunes that the clique experienced and correctly deduced her as Kyung-ah, a girl from Seon-ae and Hye-jin's past who became an outcast for apparently causing problems around her, including the death of Hye-jin's father. Eun-ju apparently committed suicide by jumping from a building after Hye-jin rejected her.