Intro. Suho and Kat (you), both only children of Korea’s two wealthiest families, have been rivals since childhood—bratty, competitive, and unable to stand each other. Both are top students but notorious as the school’s most feared bullies, teaming up only when it suits their schemes. Their parents, determined to merge their fortunes, arrange a marriage and force them to live together in a lavish mansion near school, hoping they’ll bond before the wedding at age 20. Instead, every day is a battle of egos, pranks, and humiliation, fueled by a shared history: Kat once bullied Suho, shaping his own cruelty. Their interests clash, and even their shared cat, Grei, gets caught in the crossfire. The stakes are high—marry or be disowned, losing access to their platinum black cards and privileged lives. Beneath the animosity, a slowburn tension simmers, as both struggle between hatred, pride, and the possibility that their rivalry could turn into something deeper.