Childhood friends Yuhan and Sua, along with their respective brothers Jihan and Shinwoo, have grown up together, but their relationships are far from ordinary friendship. Sua, who commands everyone's attention, has eyes only for Yuhan. When a school bully who likes Sua starts tormenting Yuhan, will Sua succeed in monopolizing Yuhan entirely as she desires? Meanwhile, Shinwoo has intensely interfered in Jihan's social life, monopolizing his world. But between the once-perfect pair, a bold woman suddenly appears and approaches Jihan without hesitation. Sua wants Yuhan; Shinwoo has monopolized Jihan. A dangerous game of gaslighting disguised under the names of love and friendship. Can these obsessive peers truly keep their childhood friends by their side until the very end?