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Nameless actress Kim Young-won. The role she had desperately wanted was snatched away by an old rival, backed by the power of a wealthy sponsor. Determined not to let it go, Young-won follows her and encounters a man known as the 'sponsor.' In a fit of anger, she impulsively kisses him. However, this man is not the 'sponsor' she thought. In fact, he is someone much more terrifying.

Jeong Bokhee is a professional boxer who doesn’t believe in love. The only thrill she knows is the sense of conquest she feels when she stands on top. For Bokhee, the ultimate high is sleeping with the opponents she knocks down in the ring. One day, during a welcome party at the gym, she hears that the Asian champion Nam Haeon will be attending. Bokhee begins plotting a strategy to conquer him. “Champ, how about a bet?” “If I can knock you down, grant me one wish.” On the day of the showdown, after relentlessly provoking Haeon, she manages to get him into a sparring match— but ends up completely defeated in just three rounds. Strangely enough, the sting of defeat doesn’t feel all that bad. Every time she thinks of his awe-inspiring punches, a rush of endorphins hits her. Bokhee vows to challenge him again and fully conquer Haeon. But the more time she spends around him… the more her heart starts to pound. As unfamiliar feelings stir inside her, an unexpected story begins to unfold…