Four friends. Two Rivalries. Only one choice. Joon-suk, Dong-su, Sang-taek and Joong-ho have been friends since they were little boys. Joon-suk is the son of a mob boss, Dong-su's father is a mortician, Sang-taek comes from a middleclass family and Jung-ho's mother sells smuggled goods on the black market. They are inseparable: peeking at dirty magazines together, splashing around in the ocean, arguing over who is faster--Olympic swimming medallist Cho Oh-ryun or a sea turtle. As teenage boys, they fight together, fall for the same girl and form rivalries that will haunt them for the rest of their lives. Joon-suk is the leader of the gang and he looks after Sang-taek, the timid bookworm. Dong-su is the brooding rebel and Joong-ho is the clown. A few years later, Joong-ho and Sang-taek go onto college and eventually lose touch with Joon-suk and Dong-su. Now in his twenties, Sang-taek reunites with the drug addicted Joon-suk and hears that Dong-su is in jail. To his surprise, his first love, Jin-sook is now living with the violent tempered Joon-suk. Years elapse again and now Joon-suk has inherited his father's organization while Dong-su has become his biggest rival. Sang-taek visits them again before taking off to study abroad and cannot help dreading the outcome for his dearest friends.