The story is set in the 1980s and follows a young student, Sang-ho, who is hiding from the authorities in a rural village. While staying in a rented room, he discovers a hole in the floor that allows him to peep at the couple living below him—a former police officer and his wife, Hee-ran. The narrative revolves around:

Eunji, tujuh belas tahun, sedang liburan sekolah. Dia biasanya menonton drama Korea yang diputar lewat siaran TV kabel tetangga waktu malam, sambil menunggu saudara laki-lakinya pulang dari kerja. Tahun itu, ada sesuatu yang membuatnya berbeda: rasa ingin tahu yang mengebu tentang dunia di luar kotanya, dan rasa ragu yang tak jelas terhadap masa depan.

Menampilkan sinematografi yang berani dan transisi emosi karakter yang mendalam.

His solitude is shattered when he accidentally discovers a hole in his floorboards that gives him a direct view into the life of the couple living downstairs. From his voyeuristic perch, he becomes obsessed with (Kim Ji-hyun), the beautiful but profoundly unhappy wife of Tae-yeol (Choi Cheol-ho), a corrupt and abusive former policeman. Consumed by loneliness and desire, Sang-ho begins to meticulously imitate Tae-yeol's sexual foreplay with Hee-ran, eventually acting on his fantasies and initiating a secret, intense affair.