Synopsis：Go Yuna gets a place at Korea International High — an elite school for the top one percent — through an equal opportunity scholarship. Then, overnight, her mother's remarriage makes her the new stepsister of Woo Seungho, the undisputed king of the school's highest social tier, the Platinums. Yuna, who has always been looked down upon for being poor, and the arrogant and cold Seungho are now family under the same roof — and they keep clashing and getting entangled in each other's lives. Between two people from opposite worlds in status and position, a precarious and dangerous romance begins.