Lim Hyeonseon has lived an ordinary life, and now, as he reaches his forties, he feels an urge to start something new before it’s too late. He decides to take guitar lessons and joins a music academy. There, he meets Cha Yeoreum, a young and passionate guitar instructor. As their friendship grows, Hyeonseon begins to rediscover a sense of vitality and excitement in his life. But life is never without its surprises. When Yeoreum starts to reveal his tender affection for Hyeonseon, their relationship takes an unexpected turn, bringing new challenges and emotions to the surface.