Soo-hyun saves a life of a little girl and receives ten mysterious pills from the girl’s grandfather.And the movie jumps thirty years back to when Soo-hyun was still a medical student and shows Soo-hyun and his then girlfriend Yeon-ah who were very much in love with each other. With the pill's help, Soo-hyun travels back in time and meet his younger self. The movie illustrates in a moving way what it means to love and live with a choice one makes for love.