Justin records Yanjun, a cruel assassin, killing. Things get complicated when Yanjun biggest enemy, Xukun, lays his eyes on Justin and his brother Zhengting (bad description, but the story will be fine)

One unlucky night Zhengting happened to witness a killing of the notorious serial killer of young males. He quickly stumbled upon a young detective named Lin Yanjun, who really avoided the case. What will happen when Xukun the leader of the team puts him in charge?