No Man Left Behind dramatizes true stories of war heroes whose missions didn't go according to plan, forcing them to fight for their survival against harrowin…

采花贼楚三少在吉祥镇犯案之后，被高官庇护，逍遥法外。柳昊辰一怒刺杀了楚三少，结果暴露了真实身份。一直追杀柳昊辰的杀手组织首脑带人来到吉祥镇，柳昊辰也恢复了记忆，四侠联手对抗杀手组织并取得了胜利。