Mr. Wu, a Hong Kong movie star, is kidnapped in Beijing by Zhang Hua's gang. The police quickly form a task force and begin the search, ignoring that detectives in charge have only twenty hours before the deadline.
Detective Ji Bai and new criminal profiler Xu Xu may seem like an awkward teacher-student pair at first glance, yet they are actually the best partners in the police force, solving one crime after another. Ji Bai slowly falls in love with Xu Xu, yet she is a girl who is as slow as a snail when it comes to love. Just as Xu Xu starts to reciprocate Ji Bai's feelings, the dormant "Angel's Killer" reappears.
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Desperate to support her family and earn enough money to get her husband out of jail, a woman with an unusual crying style becomes a professional mourner.
