Chapter 1 introduces readers to Bomi, a young woman who has just started a new life in an apartment. Bomi appears to be an ordinary college student, but her life takes a drastic turn when she meets Sangwoo, her seemingly perfect neighbor. Sangwoo is charming, handsome, and kind, but with an unsettling aura. As Bomi gets to know Sangwoo, she begins to feel drawn to him, despite her initial reservations.