Terminal cancer patient Kang Ji-ah binds herself to an acting game system in the final moments of her life and is reborn as heiress Baek Yun-hee, infiltrating an elite school for the wealthy. She must conceal her identity perfectly for one year, earning rewards for every month she manages to hold on. If three or more people expose her, she will die instantly. Using the system's card draws and the pawnshop arbitrage opportunities in its store, she navigates relationships with Kwon Jeong-woo, Won Jun-seo, Min Ha-rin, and others, carefully crafting her persona and planning every move.