While the visuals provide the horror, the score by composer (with contributions from Lee Byung-woo) provides the soul. It’s the difference between a great zombie movie and the devastating emotional landmark that Train to Busan has become.
Here is a breakdown of how the film’s music works its magic. The film’s opening is deceptively calm. A haunting, minimalist piano theme introduces us to Seok-woo (Gong Yoo), a workaholic fund manager. The music here is lonely and sparse, mirroring his fractured relationship with his daughter, Su-an. train to busan music
She practices it on the train. It’s awkward. It’s childish. But by the end of the film, that same simple melody becomes the only thing that can cut through the chaos. It represents innocence surviving the apocalypse. While the visuals provide the horror, the score
The score even quotes this melody in the orchestral finale, tying the father’s redemption to the daughter’s voice. Most horror scores are designed to manipulate you into fear. The Train to Busan score manipulates you into empathy. The film’s opening is deceptively calm
Listen to the track "Zombie in the Train" (or similar cues). Instead of a melody, you get a mechanical, ticking rhythm. It mimics the heartbeat of a terrified passenger. It sounds like a clock counting down to doom. This rhythmic anxiety keeps you on the edge of your seat without needing a single loud "braaam." And then, there is that scene. The final act.