He Engagement Party, My Death Countdown

Vivian, a ballet prodigy suffering from a terminal illness, leaves her beloved Lucas—deliberately making him believe she is a gold-digger so he won't be held back by her—while secretly arranging for him to study under a renowned master in exchange for donating her own heart. Years later, a now-successful Lucas spots Vivian working as a waitress at his engagement party and subjects her to relentless humiliation; the eventual revelation of the cruel truth—that she had paved the way for his success at the cost of her own life—unfolds a heart-wrenching tale of undying love.