A member of the corporate organization, the Jinhong faction, Nam Eunho, is a spy that was planted by the rival organization, the Deokeun faction. In the midst of stealing supplies, to secure funds for her faction, and to manipulate their books, under the orders of the Jinhong faction’s boss, she was tasked in monitoring his daughter, Chun Hee-Min. Hee-Min, who is unknown to the outside world, confuses Eunho through her existence. Behind closed entrance doors of a spacious room, where the air is dry, and nothing but the scent of the two people living there filling it, the two of them build a peculiar bond. But as emotions deepen, and shake their reason, the two of them end up making choices that can not be reversed.