[해피니스 OST]
| Lyrics |
| No. | Song Title | Artist |
|---|---|---|
| 1. | What Lies Ahead | Joe Layne |
| 2. | Pain | 홍이삭 (Hong Isaac) |
| 3. | ENIGMA | 젬마 (JEMMA) |
| 4. | EUREKA!!! (Drama Edit) | Joe Layne |
| 5. | Portrait | Joe Layne |
| 6. | REALISE (Drama Edit) | Joe Layne |
| 7. | Chaos | Joe Layne |
| 8. | Eruption | Joe Layne |
| 9. | Outbreak | Joe Layne |
| 10. | MAGIC (Drama Edit) | Joe Layne |
| 11. | Some Day | Joe Layne |
| 12. | HIGHER (Drama Edit) | Joe Layne |
| 13. | The End (Drama Edit) | Joe Layne |
| 14. | Boundary | 옹성은 (Ong Seong Eun) |
| 15. | NEXT | 윤채영 (Yoon Chae Young) |
| 16. | Resist | 임미현 (Im Mi Hyun) |
| 17. | The Cage | 신현필 (Shin Hyun Pil) |
| 18. | Unhappiness | 임미현 (Im Mi Hyun) |
| 19. | Who | 박정은 (Park Jung Eun) |
| 20. | Unknown | 임미현 (Im Mi Hyun) |
| 21. | The Apartment | 윤채영 (Yoon Chae Young) |
| 22. | Humanism | 옹성은 (Ong Seong Eun) |
[Compiled by: sleeplessaliana]
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