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In the heyday of the Chengyuan Dynasty, Shen Kuoyun, a young man from Western Shu, was hit by an avalanche in Minshan Mountain. He woke up after three days in a coma and claimed to have seen a white jade city hanging above the sea of ​​clouds. No one believed him, but this experience was like a thorn piercing his bones, making him unable to accept a mediocre life for the next twenty years. He became famous in the two capitals with his amazing literary and eloquent talents. He was introduced to the shogunate by the powerful minister Pei Heng, and was summoned by the emperor. He once thought that he had finally reached a position where he could change the world. But the cracks in the prosperous dynasty had already opened - border generals supported troops, vassal towns were enlarged, grain roads were broken, and the northern border fell. In the year when the rebels crossed the river, Shen Kuoyun was forced to board King Jing's ship, thinking he was King Qin, but he was actually involved in a doomed battle for the throne. He was convicted and banished to the wilderness of the southwest. On the way to exile, he saw burnt villages, broken inns, and refugees starving to death on the roadside. Three years later, the pardon letter arrived, and he returned eastward along the Yangtze River. When passing through Jiangxia, he met his old friend Wei Duan, a prefect who kept a county clear during troubled times. Wei Duan didn't ask him how he had lived these years. He just prepared wine for him and asked him to live in Jiangxia. Shen Kuoyun wrote the longest letter in his life in the county town of Wei Duan, addressed to all the people he knew who were dead or still alive. After finishing writing, he discovered that it was never the fame that he could not let go of, but the people he failed to save.

There is a kind of person in the world who dies with so much regret that the regret itself tears a crack in reality. In the crack is a corridor, and in the corridor is the regret of the dead. Once a living person enters by mistake, he must "respond" to the regret before the corridor collapses - not to solve the problem, but to make a choice. Often, this choice is harder than death itself. Chi Ming, 19 years old, had just come out of juvenile detention center and had nothing. The first time he mistakenly entered the corridor, he found that he could "hear" the emotions of the deceased. This ability to empathize, which he had been burdened with since childhood, was put to use for the first time. After being drawn in by the non-governmental organization "Corridor Hunters", Chi Ming began a life of walking through the corridors. Behind every corridor is the story of a dead person, and every response is a heart-wrenching choice. But he gradually discovered that the deepest parts of all corridors were connected to the same source. It was the "original corridor" that no one had ever successfully entered. It belonged to a man who had been dead for a long time. That man's regret was so great that the entire world's echo phenomenon was nothing more than his sigh. And this person's regret... Seems to be related to Chi Ming himself. Related to his mother who disappeared when he was 6 years old. He had to find that corridor, walk in, and hear what the man wanted to say. And then made the most difficult response in his life.