For years, detective Jae-hwan has been obsessed with catching Jin-hyuk, the serial killer responsible for the death of his partner and brother-in-law, even if the path to revenge means skipping a few rules. But, when the…

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，…

讲述轰动大韩民国的连环杀人团伙和不管用什么方法都想抓住他们的刑警之间的故事。