该剧以“一事不再理原则”(一旦处理过的案件不再审理的法律一般原则)为背景。讲述5年前被派为国选律师崔度贤(李俊昊饰)负责的一起女性被杀案中,该案嫌疑犯韩钟久被起诉杀人,但最终被判无罪。之后韩钟久因为其他杀人案再次被起诉,在裁判过程中他自白自己是5年前的杀人案的真凶,但因为“一事不再理原则”而无法接受处罚。将讲述即使犯人自白了,却无法惩罚的法律的讽刺故事。。A man finds out from a would be killer that his wife has paid $10,000 to have him killed. But is this mysterious man telling the truth? When both the killer and the wife turn up dead, everyone is a suspect, and the investigation takes an unexpected turn。