In the bustling Gwangseon Apartment complex, four overlooked women—Gong Mi Ri, a sharp-eyed homemaker; Chu Kyung Ja, a tough ex-cop; Park So Hee, a resourceful part-timer; and Jeon Ji Hyun, a savvy insurance agent—unite to solve mysterious disturbances threatening their community. Their first case tests their wit, courage, and newfound sisterhood as they confront hidden dangers lurking behind everyday life.