Starting with mysterious noises at night evolving into annoying disturbances during the day, Sung-eun's ordinary life takes a turn when she collides with her attractive neighbor, Eun-sung, who holds the title of private student representative. Despite his questionable standing, Sung-eun feels obliged to play the part of a caring neighbor. As their bond deepens, Sung-eun conceals her emotions, leading to a closeness that prompts her to question if Eun-sung harbors secrets of his own.