Qingshi Town, a remote town that can hardly be found on the map, has been shrouded in fog for generations. There is a legend about the "Misty Hidden Pavilion" circulating in the town - it is said that the pavilion contains secrets that can change destiny, but it has also swallowed up the lives of countless explorers. Forensic doctor Lin Mo returned to his hometown due to a bizarre old family case. As soon as he stepped into the town, he encountered a strange death: a respected old carpenter in the town died mysteriously in his workshop. The body was placed in some ancient ritual posture, and there were no signs of intrusion by outsiders. As the investigation deepened, Lin Mo discovered that the half jade pendant clutched in the deceased's hand was exactly the same as the missing token in an old case of his family. Qingshi Town in the fog is like a huge maze. Every time a puzzle is solved, more mysteries emerge. What is hidden behind the fog seems to be a shocking conspiracy that spans decades. Lin Mo not only needs to find out the truth, but also protect himself and the people around him in the shocking puzzle.