Lu Hao (Zhao Shunran) has always wanted to be an excellent criminal policeman, so he voluntarily applied to work in the serious crime team after graduating from college. In the serious crime team, Lu Hao met Zhou Yuan (Guo Xiaodong), the team leader. Zhou Yuan is actually a kind man, but he is not very good at expressing his concern, so he often conflicts with Lu Hao. After Zhou Yuan broke up with his ex-girlfriend Lin Yao (Zhao Yuxi), he moved to the home of screenwriter Bai Xiaolu (Wu Jinyan) by mistake, and the two began to live together. Bai Xiaolu and Zhou Yuan also had a grudge. Because of her carelessness, Zhou Yuan's undercover operation almost failed. At Bai Xiaolu's home, Lu Hao met Bai Xiaolu's bestie Yuan Mingqing (Pan Shiqi), and the upright Lu Hao moved Yuan Mingqing's heart.