When a school girl disappears, suicide is suspected, and one of her classmates is suspected of having goaded her into it.
On the night that 17-year-old Dong-jun's only friend, Kang-hyeon, fell from a high place, Dong-jun made a choice that determined the direction of his entire life. Dong-jun's regrets and remorse following that choice made him experience life in three different universes. These are the various lives of the 42-year-old Dong-juns who live different lives in Seoul, Daegu and Busan 20 tears later.
Jin-soo is a lonely father who has sent his wife and daughter abroad to study. One night, he hears about how a young man living next door broke up with his girlfriend. Jin-soo suggests his neighbor go to his girlfriend´s place to confess his love.
