"How can this be so good?" It's as if someone has rummaged through his mind. One day, Yoon Sung-hyun hears about a self-hypnosis app at work. Curious about the app that claims to hypnotize himself, achieve dieting, and even improve his grades, he tries to download it. But surprisingly, the app is already installed on his phone, and when he launches it, a shocking message appears. [Context: Yoon Sung-hyun goes to the supermarket with his wife to shop for groceries and begs her to sleep.] Numerous similar message files also appear. As soon as he sees the file, countless absurd memories begin to surface in his head...