Cold-faced police detective Li Ruoyi, cold, cold, and cold-blooded are all people's evaluations of Li Ruoyi. In order to insist on justice in his heart, Li Ruoyi knows that this is the only way to protect his persistence. However, Li Ruoyi, who is cold on the outside, is hot on the inside. In order to search for clues, traveling to every corner of Shanghai and working 24 hours a day to solve the case, Inspector Li, who is cold on the outside and hot on the inside, also bursts with powerful charm.