Nam Haeng Sun, a former national athlete, runs a successful side dish store with her upbeat personality and endless energy. Looking for a new challenge, she decides to enter the private education field, catering to students preparing for university entrance exams. There she meets Choi Chi Yeol, the most popular instructor, who is hardworking and renowned for his showmanship in his lessons. Despite his success, Choi Chi Yeol has become increasingly sensitive, prickly, and indifferent toward others. However, with her positivity and resilience, his encounter with Nam Haeng Sun sparks a romantic connection between them. As their relationship develops, they navigate the challenges of their personal and professional lives and discover the importance of love and support in pursuing their dreams.