Jiwan agrees to become the legal spouse of a complete stranger for three years to cover her father’s medical expenses. Tempted by the promise of 1 billion won in exchange for maintaining the marriage, she quickly signs the marriage certificate. Three years later, just two weeks before the contract ends and her payday arrives, her legal husband unexpectedly appears in her life. Will Jiwan be able to part ways with him peacefully, or will her plans take an unforeseen turn?