The O (더 오), 펄어비스뮤직 – 백야 White Night (검은사막 ‘도사’ Theme)
Track 01 from Single '도사 : 백야 (검은사막 Original Soundtrack)'
The O (더 오) – 물속을 거니는 것 처럼
Track 02 from Single "O's"
Release Date: 2015.04.13
The O (더 오) – 안녕
Track 01 from Single "O's"
Release Date: 2015.04.13
The O (더 오) – 긴 여행
Track 01 from Single "긴 여행"
Release Date: 2020.02.18