Raised in the shadow of a father consumed by a gambling addiction, Yoo Yiyeon becomes a masterful casino hustler, skillfully preying on those who strike it rich. One fateful day, Bae Sungyoon, a former hotel chef, hits the jackpot and finds himself seated across from Yiyeon at a VIP blackjack table. Sungyoon's fortune takes a nosedive, causing him to lose all the winnings, and he ultimately wagers himself against Yiyeon, ending up on the losing side. Post-game, Yiyeon escorts Sungyoon home and proposes a deal: in exchange for wiping clean Sungyoon's gambling debt, he requests possession of Sungyoon's body. Will Sungyoon end up betting more than just his body? Or will the two unexpectedly end up hitting the jackpot with each other?