My bias gets on the last train

Every night, Yeo-un takes the same last train home, following the same routine without change. But there is one thing that always draws his attention — a mysterious girl carrying a guitar, whose presence stays on his mind long after they part ways. Their connection begins when they discover their shared love for the indie band Long Afternoon, turning their quiet late-night meetings into something deeper. However, Hae-in is hiding a secret: she is the true voice behind the band. As their feelings grow stronger through music, the truth she has kept hidden threatens to change everything. When their song finally reaches its final note, will their love become a beautiful melody or end in heartbreak?