Criminal psychology expert Shen Zhiwei joins the city's criminal investigation team as a consultant in order to investigate the truth behind her mentor's suicide. Captain Lu Chen initially rejected her "paper talk", but he was impressed by her sharp wisdom in fighting side by side again and again. While solving a series of serial murders caused by undercover conspiracies, the two grew from partners who did not trust each other to each other's only soul armor. In the end, while uncovering a huge conspiracy that shook the police world, they also gained trust and love that transcended life and death.
