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.
An education officer who was dispatched died after a gunshot went off in the dead of night. At the same time, deserters flee to the DMZ in the access control zone, and the 3rd platoon is urgently deployed to the DMZ search operation. There, the crew sees an unidentified soldier, not a deserter or a search crew.
1953, the Korean war has ended, but the fight for survival has just begun. Two 18 year old boys, Tae-ho and Jong-du, live in a camp for orphaned boys, which is more of a concentration camp where everyone suffers from hunger, inhumane treatment and unbearable work conditions. But these two have a dream of a better tomorrow. Tae-ho is the one with wits and brains and Jong-du is the tough street fighter. Together they scheme to steal US Army supplies and recruit other boys to grow their business. But when they start to take business away from the local gangsters, their fight fur survival turns into a war…
Su-ho is a plain high school boy, and Su-eun is a bright and beautiful girl in the same school. For some unknown reason, Su-eun has a crush on the boy, and for equally mysterious reasons she rescues Su-ho in the sea though he doesn't know who actually saved him.