Seo Hae In, legitimate heiress to the vast MK Group fortune, enrolls at an ordinary district high school under an unassuming guise. Seeking authentic companions rather than parasitic social climbers, she trades designer garments for thrifted blazers and blends into the classroom. Her low-profile experiment shatters when her housekeeper's deceitful daughter, Si Eun, arrives at the gates loudly proclaiming herself to be the MK empire's sole successor.
Si Eun quickly seizes control of the campus hierarchy, inciting classmates to ridicule Hae In while flaunting luxury goods swiped from the family residence. Rather than exploding in outrage, Hae In bides her time and meticulously documents the fraud. With the corporation's upcoming anniversary gala on the horizon, she prepares to pull the curtain on the impostor in front of high society.
