Track List:
Part 1
01. GRASS (그래쓰) - Coming to you
02. GRASS (그래쓰) - Coming to you (Inst.)
Part 2
01. Kang Seung Yoon (강승윤) - Your voice
02. Kang Seung Yoon (강승윤) - Your voice (Inst.)
Part 3
01. KLANG (클랑) - No way to go
02. KLANG (클랑) - No way to go (Inst.)
Part 4
01. Elaine (일레인) - Hear for you
02. Elaine (일레인) - Hear for you (Inst.)
Part 5
01. Kim Jae Hwan (김재환) - Promise you
02. Kim Jae Hwan (김재환) - Promise you (Inst.)
Original Score
01. Jin Myung Yong (진명용) - Prelude to Case (사건의 서막)
02. Byun Dongwook (변동욱) - Questionable message (의문의 메시지)
03. Lee Ho Sung (이호성) - Golden Time Team (골든타임팀)
04. Jin Myung Yong (진명용) - Shadow of Evil (악의 그림자)
05. Byun Dongwook (변동욱) - Unending Sadness (끝나지 않는 슬픔)
06. Kim Dal Woo (김달우) - End of Wrath (분노의 끝)
07. Byun Dongwook (변동욱) - New Incident (새로운 사건)
08. Lim Hayoung (임하영) - Devil Appearance (괴물의 등장)
09. Yoo Jonghyun (유종현) - Chamber of Secrets (비밀의 방)
10. Kim Dal Woo (김달우) - Tears of Darkness (어둠의 눈물)
11. Jin Myung Yong (진명용) - Pain and Growth (아픔 그리고 성장)
12. Jin Myung Yong (진명용) - Chases (추격)
13. Lim Hayoung (임하영) - Boy Dong Bang Min (소년 동방민)
14. Jin Myung Yong (진명용), Kang Kyung Chul (강경철) - Fighting (격투)
15. Shin Min Yong (신민용) - The Last of joys and sorrows (애환의 마지막)
16. Lim Hayoung (임하영) - Voice 4 Opening Title (보이스4 Opening title)