Ji-Won wants to become a successful boxer, but it's not an industry known for being female-friendly. To make matters worse, her family doesn't support her dream. Min-Joon is wealthy, carefree, and heir to his family's empire. The two are polar opposites, but once Min-Joon sets eyes on Ji-Won, he's smitten. Ji-Won can't be bothered by romance. But Min-Joon is determined to win her over, and the easiest way to do that is to help her become one of the world's biggest boxers. Ji-Won protects her heart by TKO'ing anyone who tries to break through. Will Min-Joon?