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Mingyu (played by Zhang He) is a middle school teacher with a gentle, upright, and kind nature. One day, while assisting someone in apprehending a thief, he is mistakenly arrested by Tong Zhen (played by Jun Ji-hyun), a female police officer who is on leave and has a fiery, righteous, and intolerant personality. Tong Zhen then tortures Mingyu to extract a confession, only to discover later that he is innocent. By then, Mingyu has been beaten to a pulp. After recovering from his injuries, Mingyu is sent by the school to a red-light district to tutor problem students, and the police arrange for someone to protect his safety. However, to Mingyu's surprise, his protector turns out to be Tong Zhen. The two, who initially glare at each other with animosity, begin an awkward partnership, which eventually leads to the development of feelings between them.