At a charity event for the visually impaired, right in the center of the glamorous party, shines Yoon Seoha, the adopted daughter of a famous assemblyman who glows brighter than anyone else. However, to her, having lost her sight, this brilliance is not a shelter, but a pair of shackles. To escape this hellish bondage, Seoha proposes a deal staking everything she has. Her partner is her arranged marriage partner, Han Junhyuk, rumored to be an uncontrollable 'mad dog'. "Please marry me. If you do, I'll make sure to leave you as a widow so I won't become a blemish on your record." What will be the end of this precarious arranged marriage that began with a promise of death?