Once overweight and insecure, Zheng Xiumin is bullied by heiress Kang Yoo-jin at work and pushed off a rooftop to her death. Reborn as orphan Han So-eun, she is granted a "Heart Points Exchange System" that rewards her for winning others' affection. With her mesmerizing voice, she lands a job at an exclusive private club and systematically seduces Kang Yoo-jin's arranged fiancé, her standby suitor, her cousin, and her junior—each conquest earning points that gradually transform her appearance and physique. Using the influence of these four wealthy men, she tears off Kang's mask of hypocrisy, exposes her crimes of assault and oppression, sabotages Sejin Group's partnerships, and forces Kang into overseas "recovery." In the end, the heroine lets go of her bitterness, finds companionship with those she has redeemed, and achieves both self-salvation and total revenge.