Lin Yuan is an ordinary delivery boy who rents in a six-story old building in the old city.
Until one morning, he picked up a girl in the alley.
She said she walked for three months to get here. She said she was waiting for him. She said she had nowhere to go.
Lin Yuan took her home. He didn't know that this decision would turn his dilapidated rental house into a monster house - the last refuge deep in the city.
One after another, mysterious women appeared next to him. The eunuch playing the guzheng on the rooftop said that the sound of the guzheng could be carried far away by the wind. Feng Sanniang, the teahouse proprietress, knows everything about that building, but she won't tell. There was also the shadow on the rooftop opposite who was always looking out the window - she was confirming something.
They all have places they can't go back to. They were all being chased by something. And that old building is their only safe haven.
Lin Yuan originally just wanted to deliver food safely. But now, the cracked sky outside is getting weirder and weirder, and predators in the dark are approaching.
He doesn't want to be a hero. But he found that when those girls looked at him, he was becoming the guardian of the building.
The door to the monster house has been opened. Someone came in. Someone is still on the way. And things outside started knocking on the door.
