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Su Ziqiu, a woman from Hong'an County, did not return after receiving a call from home. The next day, the police found that she had fallen off a cliff. After understanding, she had no motive to commit suicide. This incident was not as simple as falling off a cliff in a car accident. What kind of behind-the-scenes killer is able to surround the police? What kind of darkness is in his heart that leads to this case? What kind of trust does he need to gain to make this method a hit? This is definitely not an ordinary murder case, or it has been planned for a long time...