Storyfollowsfouryoungmenwhohavejustturned21yearsofage. 　　LeeChoo-Won(SeoJun-Young)isanathletewhocannotforgethispastlove.MaGoo-Rim(BaekSung-Hyun)wasonceapopularsinger,butbecauseofadrugscandalismiredindespair.ChoiSeo-Won(ChoiTae-Hwan)isamedicalstudentatprestigiousSeoulNationalUniversity,buthehasleukemia.SungDae-Sung(By..ccc