So Long, See You Tomorrow

At night Kang-Hyun fell from a high place, a 17 year old Dong-Jun, who's the best pal of his, made a choice to determine the direction of life afterwards. Deep regrets and guilt about the choice make him to live as different selves in the parallel universes. Those are three different lives of Dong-Jun(s), who are 42 year old men, living in Seoul, Daegu and Busan after 20 something years since then.