Something lurks beneath the city of Yancheng, and as international spotlight falls upon it, the darkness begins to stir. As one of the police force's best investigators, the task of unraveling the city's morbid mysteries falls to Luo Wenzhou. But as the case develops, a common thread seems to emerge: the infamous playboy and wealthy CEO, Fei Du. With a harrowing past of his own, Fei Du is no stranger to the ins and outs of the crime investigation unit, and his suspiciously shrewd insights into the workings of the criminal mind are a great help to Luo Wenzhou's team. As they work together to pursue justice, Luo Wenzhou must reconcile this new version of Fei Du-sharp, astute, with impeccable skills of deduction-with the troubled child he once helped...