Lin Ye, a 20-year-old college student, is short of money, has a cautious and calm personality, and has a bottom line. He brings his own ancestral black wooden sign to ward off evil spirits and can see the Yin energy. An ordinary college student accidentally enters the Yin industry in order to make money. He understands the rules, practices courage, relies on the wooden sign to save his life, finds out the ways of the Yin industry at the bottom, and sees the sinister nature of human nature.
