In the bustling heart of Seoul, where the rhythm of daily life often drowns out personal desires, two unlikely souls find themselves harmonizing in unexpected ways. Yoon Ji-ho (Kim Beom Gyu) is a meticulous sound engineer who lives by schedules and logic, while Kang Min-seok (Ji Seung Jin) is a free-spirited musician who thrives on spontaneity and emotion. When Min-seok stumbles into Ji-ho's recording studio to lay down a demo, their clash of worlds is immediate and electric. Yet beneath the friction lies a quiet resonance neither can ignore—a melody of stolen glances, late-night sessions, and the gradual tuning of two hearts to the same frequency. As they navigate the messy intersection of art, obligation, and vulnerability, Tune In explores what it means to truly listen: not just to music, but to the person standing beside you. This tender, six-episode miniseries captures the beauty of finding your rhythm with someone who dares to match your imperfections, proving that sometimes the most perfect harmony comes from the most unexpected notes.