Lin Yue, 24 years old, is a new detective in the Criminal Investigation Detachment of Beijiang City Public Security Bureau and a materialist.
One rainy night, he received a report: Residents of Tongzilou in the old city claimed to hear knocking on the wall from an empty room. After breaking in, he found a female corpse in the wall that had been sealed for half a year - the corners of her mouth had been cut to the base of her ears, and she died in a strange manner.
What was even weirder was that that night, he heard sounds in the wall.
Su Zhe, an old acquaintance from his childhood, suddenly appeared and told him a truth that subverted his cognition: Lin Yue was a natural "guide" who could see the underworld and communicate with the souls of the dead. And the tube building built on the mass grave is connected to another world - "Yin Yin". Countless trapped souls are waiting for redemption in the wall.
The female ghost Wang Xiu'e's obsession is to "give me back my face." What she wants is not the face, but the dignity that has been trampled upon.
When the logic of criminal investigation meets supernatural rules, and when justice for the living extends to the world of the dead, Lin Yue finds that he must not only solve the case, but also lead a way out for the souls trapped in the darkness.
"I take care of the living, and I take care of the dead."
This is a story about protection. Protect the living and let the dead rest in peace.
