Lin Mo, a poor young man, rented an old house in the ancient city for 99 yuan a month that was rumored to be haunted. I thought I was getting a bargain, but on the night I checked in, I bumped into Su Wan, the demon king in white. Lin Mo, who was so poor that he had no fear of ghosts and gods, instead of running away, took out the "Roommate Agreement" and made a three-part agreement with the thousand-year-old banshee, starting a ridiculous inter-species cohabitation life.
As the demon keeper Xu Chuan comes to the door, the mysterious "door opener" and the black ring organization behind the scenes appear one after another, the secrets of the world gate that have been buried under the old house for thousands of years are gradually revealed. Lin Mo unexpectedly learned that he was a descendant of the Lin family's seal-keeping lineage, and that the half-yang seal on his wrist and the yin seal on Su Wan were originally a complete seal. Thousands of years ago, the two had guarded the realm gate side by side, and Su Wan also lost key memories due to the gate-changing formation.
The clues laid down by grandpa twenty years ago, the return plan that was tampered with seven years ago, and the ancestor Lin Changyuan who has been trapped in the gap for thousands of years, all the puzzles point to the plot of the third boundary nail and the black ring - to use the Yin-Yang Contract to restore the control of the boundary gate and break the thousand-year boundary-keeping order.
From a poor tenant who was worried about the rent, to the new seal keeper in charge of the complete town boundary seal, Lin Mo, accompanied by Su Wan and his partners, tore through the layers of fog, guarded the boundary gate, and made this old house worth 99 yuan truly a home.
