A man trapped in his dream traces back his past until the deepest memory. While preparing his documentary about an old town in Seoul, Soo-min accidentally films a crime scene which a woman is killed by a group of masked men. He runs away with his camera, but soon gets caught, and smashed on the head with hammer by the men. Not long after, Soo-min wakes up naked but without wound in the alley, and believes that he had a nightmare. On his way back home he bumps into the masked man, and gets killed once again. Every time he tries to escape from the alley, he runs into weird situation and is brought back to the same alley…