Senior criminal police officer Wang Zhiyi (played by Alec Su) has a very poor efficiency in handling cases. He looks at the matchmaking photos of marriage introductions more seriously than the suspects' photos. He has a very accurate premonition of dangerous tasks and always gets diarrhea at the right time to avoid the alarm. But this time, Zhiyi, who has never been valued by his superiors, was suddenly assigned a super task - monitoring Gao Yiping (played by Ariel Lin), a new colleague who just graduated from the police academy. It turns out that Gao Yiping is the daughter of the police chief. The chief can't persuade his daughter to give up being a police officer, so he has to carefully select his daughter's partner. After consideration, Zhiyi, who is good at dodging tasks and seeking safety, is the best candidate! From the first day of the partnership, the two were deliberately assigned by their superiors to handle idle tasks. Zhiyi was happy, but Yiping's enthusiasm was poured with a big basin of cold water. Yiping's full of blood met Zhiyi's carelessness. The two quarreled all day long and became a pair of enemies who could not tolerate each other. However, while investigating the accidental death of a puppy in the community, they accidentally found the whereabouts of the wanted drug dealer Caozhi (played by Wu Zhongtian), and thus got involved in a series of murders. Encountering a difficult case for the first time, Yiping was excited to find out the murderer behind the scenes to prove herself, but Zhiyi only wanted to pull Yiping out of danger in order to protect himself. The enemies gradually got involved in the core of the whole case, but as the clues to the case emerged one by one, they fell into danger that they were not aware of when the murderer was about to be revealed...