Synopsis：In the early 1980s, unemployed youth Zhang Baoqing arrives at Yingtun in the Changbai Mountains of Northeast China, where he meets the siblings Caigua and Er Bizi, children of a local hunter family. After being possessed by the legendary bandit king Ma Dianchen, the three are led by the fox immortal Hu San Taiye into the Snow Valley Tiankeng, where they discover the eerie wonders beneath the fabled sinkhole: Ma Dianchen's three-soul paper effigies, the Hell River of the Headless, and the Flaying City from underworld lore. This unveils the legendary tale of Northeast's gold king Ma Dianchen from years past and the mysterious Tiankeng case. Facing unknown dangers ahead and relentless antagonists behind, Zhang Baoqing must find the truth and a path to survival... Adapted from the novel of the same name by Tianxia Bachang, the film follows young Zhang Baoqing and his companions Caigua and Er Bizi as they accidentally enter a mysterious Tiankeng, cleverly thwart the greedy Blood Mushroom's scheme, and uncover the truth behind the golden treasure.