A 40 years old unknown actor, Ho-jun, runs a fishing YouTube channel. The day after he fails an audition, he goes to a fishing spot to shoot YouTube videos. There, he bumps into director Nam and actress Hee-jin, who has already been cast in a leading role. Three small fries are wandering in the reservoir.

Gabdunri, one of the three most haunted houses in Korea. Following a man who is looking for his sister who disappeared 10 years ago, the documentary filming team begins to experience unbelievable things. No one who enters there can come back alive.

During a home visit, Jeong-mi discovers a young boy and his little sister living in a house with a large manhole in it. The children ask Jeong-mi to go down the manhole.