One night, Ding Juan went to an appointment to meet her boyfriend Li Liang and found him lying dead in her house. Police officers Qian Kai (Xu Min) and Chen Minghui (Zhong Xinghuo) of the Donghai Municipal Public Security Bureau rushed to the scene of the crime after receiving the report. After the forensic doctor determined that Li Liang's death was a homicide, the two noticed some clues, such as a small bird feather on Li Liang's wound and an obvious fingerprint on the tea cup. Among them, in Li Liang's notebook, there was a sentence, "Ah San, I will never let you go!" After investigation, Xiao Qian and Lao Chen learned that there were two people named Asan who were acquainted with Li Liang. One was a man nicknamed "Rubber Fish Asan" who worked at Qingxi Farm in Huangshan Mountain. He and Li Liang had had financial disputes. The other was Fang Mingshan (Yan Xiang), a photographer from Donghai TV who had worked with Li Liang. He had a deep conflict with Li Liang. After some evidence collection and identification, Fang Mingshan became a major suspect, but the case was not that simple.
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