Qingchuan Town is a "fog prison town" deep in the Daba Mountains - a century-old thick fog wraps up the old houses of the Ming and Qing Dynasties. The townspeople adhere to the taboo of "when the fog rises, the soul is lost, and when the fog disperses, the bones are revealed" and keeps secret from outsiders. Shen Yanqiu, a graduate student in the Department of History, entered the town with half a bronze token in his hand, just to find his missing mentor Zhou Mingyuan, but he came across the strange story of the townspeople offering sacrifices to the mist late at night, and the mad woman crying "Mist Queen asks for her soul".
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Purpose: Taking the "fog sacrifice" taboo in Qingchuan Town as a guide, it tells the story of Shen Yanqiu's search for a teacher to solve the puzzle, and the face of the human dilemma of "sacrifice of the seal keeper", revealing the secret history of human sacrifice covered by thick fog, exploring the ethical paradox of "exchanging the safety of the few for the safety of the many", and finally making a choice between his own destiny and the lives of others.