The heroine Su Yan is a rare forensic doctor with yin and yang eyes. She can see the souls left behind in corpses. She has the highest crime detection rate in the entire Internet. However, she is haunted by the same ghost every night - the male protagonist Xie Wuwu is a thousand-year-old ghost guarding the two realms of yin and yang. Because of an unjust case three hundred years ago, her soul was locked in the world of the world. The initiator of the unjust case that year was Su Yan's ancestor. Xie Wuwang originally wanted to entangle the descendants of the Su family, but found that Su Yan could see him and help him find physical evidence of the unjust case, so he was forced to tie up with her to investigate the case.
She was forced to be bound to him. During the day, she examined corpses and inquired about souls; at night, he explored the underworld.
When the evil spirits hurt her, it was he who used the remaining ghost energy to build a barrier; when clues about the injustice emerged, it was she who broke into the desperate situation with her flesh and blood.
When the truth of three hundred years ago was revealed, the mastermind behind it was still alive and threatening her life.
Xie Wuwang was willing to lose his soul in exchange for her life, but Su Yan held the seal and went retrograde, heading straight into the Yin and Yang world:
"My ancestors owed you three hundred years ago, and I will repay it in this life. But you want to just disappear like this - have you asked me, this 'accomplice'?"
