Liu Tan (played by INFINITE Kim Myung-soo), the leader of an unknown band "ONEMORETIME". He said, "I'm completely tired of music and love now", but now things have turned around! ! The chairman of a large record company, who is known for his good looks, proposed to him to make his official debut. Liu Tan, who gave up music and love, should start a new life. However, what is incredible is that "that day" on which he wanted to start a new life keeps repeating... And he witnessed his girlfriend Daren (played by Yoon So-hee) who died in an accident on that day several times. After living the same day over and over again, Liu Tan, who knew the truth, decided to fight to save his ex-girlfriend.