After retiring from her career as a national athlete, Nam Haeng Sun now owns a humble side dish store. Her cheerful personality and boundless energy catch the attention of Choi Chi Yeol, a popular and hardworking private instructor known as the "Trillion Won Man". Despite his reputation, Choi Chi Yeol has become increasingly aloof and irritable due to his growing success. However, their relationship is not without challenges. As they navigate the ups and downs of their personal and professional lives, they must learn to confront their own shortcomings and trust in each other's strengths. Will their love be enough to overcome the obstacles in their path?