Byul, a popular alpha and a first-year high school student, once trained to be an idol but has since left that path to attend school like a regular kid. His world takes an unexpected turn with the sudden birth of a younger sibling, introducing new challenges to his daily routine. Byul's childhood friend, Siwoo, has secretly harbored feelings for him for years. However, both being alphas, Siwoo has kept his emotions hidden.

As the two navigate their growing closeness after a period of time apart, Byul faces adolescence head-on, grappling with friendships, family relationships, and his sense of identity. Along the way, he rediscovers his passion for music and begins to mature through these transformative experiences.