Seung-jin is preparing for a TV audition program to become a singer. On the first night at his new place, he suddenly hears a woman’s ghostly wails. It turns out that Seung-jin’s next-door neighbor, Ra-ni has been driving people away from this apartment because of the super-thin walls. But Seung-jin won’t go without a fight. After a battle of loud noises, they decide to take turns being noisy. They even don’t know each other’s names or faces. But as they share their lives, they start to develop strange feelings for each other...