Mi-Ha is a tenacious and highly competitive young woman who refuses to concede defeat. Her unwavering determination is so intimidating that it often puts boys on edge, a characteristic her older brother instilled in her through six years of military-style training to ensure her protection. Nevertheless, when a resolute and charismatic transfer student by the name of Sung-Suh enters their lives, he manages to steal Mi-Ha's heart. The question remains: will he be able to placate the "fierce beast," and will Mi-Ha's brother approve of their relationship? It's time to gear up for a challenge!