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Five years ago, a vicious man who called himself Cuckoo sneaked into a house with two other men and bumped into Xiao Tao, a woman who was staying at home alone. After they discovered that Xiaotao's husband was a policeman named Qiaowei, they did not leave. Instead, they lurked in the living room, subdued Qiaowei who happened to be returning home from get off work, and handcuffed him to the window sill. Cuckoo hurts his wife in front of Hashio and then escapes. After that, the cuckoo disappeared without a trace as if it had evaporated from the world. For five years, Hashio has devoted himself to arresting Cuckoo and avenging his wife who could not bear the insult and chose to commit suicide. He tried every means, even resorting to violence, and finally received news that the cuckoo, which had disappeared for five years, had returned again. Murder cases occurred one after another, and Qiao Mo followed the traces left by the cuckoo and began to pursue the murderer. A vicious fugitive on the run and another a rebellious, cold-blooded police detective. Who is the truly cruel one?