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Song Tianming, a courier who has been out of work for 60 days, always reaches for the disappearing scanner gun next to his pillow in the early morning. In the past twenty years, he has memorized the slope of every alley in Leping and has delivered more than 30,000 parcels. However, he did not expect that the turning point in his life was hidden in the copper lock left by his grandfather to "clear the grievances". The female corpse Lin Hui floated up in Leping Lake. The forensic doctor concluded that she was drowned, but the retired policeman Wu Wu found something strange. The moment Song Tianming's fingertips touched the copper lock, burning sensation ran down his blood vessels: he remembered Lin Hui's gentleness when signing for the delivery, and even more so, Zhang Lei's strange eyes staring at the express box. The ancient lock reflected a blurry image - in the turbid lake water, Lin Hui's hand grasped the green and white sand, and the man in the white shirt on the shore clutched the "fragile" cardboard box, it was Zhang Lei! The courier's street wisdom of twenty years became the key to breaking the situation: he could tell Lin Hui's habit of collecting express delivery, point out the difference between the reed fiber of Wangshan Lake and the diatoms of Leping Lake, and even find out the driving trajectory of Wangshan Lake from Zhang Lei's lie about "going home". When the copper lock becomes hot next to the evidence, when the fibers between the fingernails and the red mud in the ruts prove one by one, the obsession that cannot be loved finally reveals its true form, and the mystery of drowning is revealed layer by layer. From an unemployed person to a criminal investigation consultant, Song Tianming walked out of confusion holding a copper lock - it turns out that his ability to remember client addresses and his unusual acuity are never in vain. The wind in Wangshan Lake is still blowing, and the next soul who needs to "wash away his grievances" is waiting for him to awaken the silent truth with the warmth of his fingertips.

Ah Xing, who loves to fish, accidentally traveled to the 12th century, and conquered the world with Genghis Khan, the founder of the Great Mongolia, and also captured the hearts of many beauties...