The Guest (2018)

S1E1 It Comes from Deep Down in the Ocean

In 1998, the small village of Gyeyangjin fell under a terrifying curse. A powerful evil spirit named Sohn began possessing villagers, driving them to kill. Young Yoon lost his parents when his own older brother, taken by the demon, turned on them. Meanwhile, the psychic boy Hwa Pyung suffered a similar tragedy—after being possessed himself, his mother was killed.