影片翻拍自2009年的香港电影《意外》，讲述将雇凶杀人捏造成事故的组织在接到新的委托后开始的故事，杀手荣日（姜栋元 饰）在捏造杀人的过程中经历了突发事故，他为了找出幕后主使而怀疑身边所有人。
Yujeong, who works as a night shift nurse at a general hospital's cardiology department, is now told that her 12th-grade younger sister, Kijeong, has been arrested by the police as a suspect in an infant abandonment case. Only then does Yujeong start to make desperate efforts to rescue her sister.
