Lin Yan, the mentor of martial arts detective Chen Lan, disappeared while investigating the secret of the ghost building. Chen Lan inherited his mentor's "Uncanny Notes" and followed the sporadic rule prompts in the notes to enter Wanglong Tower. Each floor of the building has different rules: on the first floor, "all oil lamps in the corridor must be lit before sunset", on the second floor, "you must wait three minutes before responding to a knock on the door"... Those who violate the rules will be dragged away by the shadows. Chen Lan relied on his superb martial arts and keen observation to crack the rules. On the way, he met Su Tang, a girl who was also looking for someone, and the two walked together. As they go deeper, they discover that the rules of the ghost house are related to a massacre of a family decades ago, and the disappearance of the mentor seems to be related to the murderer of that year. When they arrived at the top floor, they discovered that the rule maker was a survivor of the tragedy who was bound by resentment. Chen Lan had to choose between abiding by the rules and breaking the curse, while uncovering the truth about his mentor's disappearance.
