Sehun comes back to Seoul after six years in America. He came back for Sulli, only to find out from her unnie that she's been missing. Sulli, now known as Choi Jin-Ri, daughter of a famous CEO knows nothing about her real self, comes back from Australia after getting medical treatment. With a new guy in the picture and Sulli seeing him as a stranger, will Sehun be able to win back the girl who was madly in love with him?