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Facing a trail of murders staged as chilling word games, a rookie police captain and a goofy detective race to solve a serial killer's deadly puzzles.

Dong, a wannabe actor, finally getting the once-in-a-lifetime opportunity to fame and success, wakes up with a dead woman, Meng, beside him. Unable to piece the night before together, Dong is determined not to let it stand in his way. He cleans up the scene and sets it up like a robbery went wrong but leaves traces of himself to be found unknowingly.While the police search the apartment, it turns out all residents have something to hide. A foreign caretaker always quarrels with Meng, a peeping Tom at the massage shop. This landlord seems kind and polite but, in fact, abuses his wife, an inharmonious family that pretends to be happy, and an owner of a publishing house in debt. To unravel the cause of Meng’s death, the long-kept darkest secrets, and everyone seems to have a motive for this murder.

Chang Ya-nan was once a student at the police training school. Due to health issues, she had to abandon her training and later married a police officer. Tragically, after several years of marriage, Ya-nan’s husband suddenly passed away. Forced to support her family, Ya-nan had to work as a cleaning staff member handling special cases at Sunshine Cleaning Company. Unexpectedly, this job brings her into contact with a group of colleagues, leading to workplace relationships that, although appearing on the fringe, contain warm human connections.