Choi Seo-yul, a college student who regards sex as just a playful activity. One day, he meets the clumsy Kwon Eun-seol at a club.\n\nSeeing that Eun-seol is clearly a beginner in sex, Seo-yul reaches out with his seductive charm and successfully lures Eun-seol to a motel. As expected, Eun-seol is innocent, and they spend a steamy night together just as Seo-yul wanted. The next day, Seo-yul leaves the hotel without even saying goodbye to Eun-seol and quickly forgets about her.\n\nTwo weeks later, Seo-yul finds himself needing to go to the department office, where he unexpectedly meets the woman he spent the night with, Kwon Eun-seol. But this woman is not just a younger girl! She's actually a teaching assistant?!\nMoreover, far from being innocent, she turns out to be a seasoned player!\n\nIn front of Seo-yul, who has experienced all sorts of ups and downs, stands the ultimate Kwon Eun-seol. Their chaotic romantic comedy unfolds. Who will emerge as the final winner of this game?