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Bones were unearthed during the renovation of the school laboratory building, and an old case that had been gathering dust for more than ten years was revealed to the world. As the captain of the Shuichuan Criminal Police Brigade, Tan Qin and Yun Ye, the trainee police officer he was responsible for, went into investigation as usual. After that, they solved five more cases one after another. Unexpectedly, after each case was solved, Bian Jun discovered the connection, which involved her past. It was too long ago, but she still remembered that boy, and she suspected that all the cases that appeared within Tan Qin's scope of responsibility were related to that old friend. All speculations have their source. It turns out that the source is her, not him.

The male protagonist was originally a god from the Nine Heavens. He met the female protagonist when he came down to earth to undergo a calamity, and the two fell in love with each other. Unexpectedly, there was demonic energy in the soul of the female protagonist. In order to eliminate the hidden danger of the demon clan, Jiuchongtian was angry and dispersed the female protagonist's six souls. When she was about to die, the male protagonist rescued the female protagonist and escaped to the Netherworld. In order to save the one he loved, Yishangshen was willing to go to the Netherworld to be a soul seducer. The Lord of the Netherworld recognized that the male protagonist was the son of an old friend, and she agreed to save the female protagonist, firstly to take care of the male protagonist, and secondly to make up for her own mistakes. The evil spirit in the heroine's soul comes from the Lord of the Netherworld and her old friend. The five dungeon stories are mainly to reflect the growth of the heroine and to repair the heroine's soul by dispelling resentment. During the final battle, the male protagonist sends the female protagonist into reincarnation. The Netherworld defeated, and a thousand years later, the heroine had accumulated enough virtues and became a real ghost, staying with the male protagonist in the Netherworld.