Female college student Lin Wanxing returns to her hometown for a funeral. The death of her grandmother causes strange things to happen frequently in the old house: the coffin is unusually heavy, strange carvings appear on the locust tree, and ancient runic books and peach wood boxes are hidden among the relics, revealing the secret of the family's "treekeeper" who has been protecting the tree for generations. After returning to school, she was entangled in mysteries and ran into Jiang Chen, the school boss. This computer science student who was proficient in metaphysics saw through the evil formations hidden in the runes at a glance.
In order to find the truth, the two returned to the old house, found clues in the secret passage that their grandmother was murdered, and identified the mastermind "Mr. Mu" behind the scenes. As the investigation deepens, they are involved in a century-old grudge between the local prominent Mu family - the Mu family wants to release the resentful spirits suppressed under the locust tree in order to avenge the plague that year. Late at night, the rituals of carving figures into trees and raising evil spirits come one after another, and the crisis is approaching step by step.
During the struggle, Lin Wanxing's pure-blood tree guardian power awakened, and Jiang Chen relied on his family's metaphysical knowledge to fight alongside her. From consulting ancient books in the library to exploring the secrets of the Mu family's old house, from a life-and-death chase in the locust forest to the ultimate confrontation at the altar, they deciphered the secrets of runes, prepared suppression rituals, fought against evil forces, and shouldered the shackles of the family's fate. On the road of exploration where fear and trust are intertwined, a quietly growing affection makes this unknown journey even more complicated, and the prelude to the final decisive battle has slowly begun on the night of the full moon.
