How Did He Become Mr. Yin Yang?

An exorcism ritual in a mountain village that everyone thought was very simple caused three famous local duans to fall into coma. At this time, Zhao Chengyun, the village chief's grandson who was supposed to be studying in Kyoto, suddenly returned to this small mountain village. The reservoir that is bound to have trouble every four years, the inexplicable black and blue marks on the villagers who work early in the morning, the late-night surveillance warning and the barking dogs in the middle of the night, the huge black shadow in the reservoir, the heavy black iron chains exposed by the collapse of the rocks, and the man who suddenly appeared in the village claiming to be just to ward off evil spirits. What secrets are hidden in this small mountain village? And is this mysterious man really just appearing in this mountain village to ward off evil spirits?