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Han-Soo (On Joo-Wan) lives alone with his mother in a small town by the sea. He is the star on his school's swim team, but, just as they are preparing for a national competition, Han-Soo quits the team. Han-Soo then learns that his mother attempted to commit suicide. Han-Soo now finds himself having to take care of his comatose mother and all the bills at home. Meanwhile, Han-Soo falls for his much older neighbor Yoo In-Hee (Kim Ho-Jung).

A high school student, Young-Sin (Park So-Dam), gets hit by a car at night. Soon, she suffers from mysterious ailments. Priest Kim (Kim Yun-Seok) knows the Young-Sin and visits her in the hospital. He is sure she is possessed by...