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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?
College student Jaeyeon gets hit by a delivery bike. She dies and reincarnates with her memories from past life. As a nanny of a little princess, she somewhat gets used to her new life... Except that she suspects the five-year-old daughter of the tyrant emperor is also a reincarnated soul from modern time-just like her! A complete mismatch, the princess and the nanny must collaborate in order to survive in the new world under the tyrant's rule.