A horror film about a young woman suffering from a bizarre experience in a low-rent rooftop house and eventually learning the terrible things that happened in the house.

As the characters gather together in a mountain cottage trying to fulfill each one's own purpose, a brutal war begins among them.

Gurus in the late Goryeo dynasty try to obtain a fabled, holy sword, and humans in 2022 hunt down an alien prisoner that is locked in a human's body. The two parties cross paths when a time-traveling portal opens up.