V.O.S, an acronym for "Voice of Soul," is a South Korean R&B group that has been capturing the hearts of fans since their debut in the Korean music industry. The trio originally consisted of Park Ji-heon, Kim Kyung-rok, and Choi Hyun-joon, but Park Ji-heon left the group in 2010, turning V.O.S into a duo. They first entered the spotlight in 2004 with their smooth harmonies and emotive ballads, rapidly gaining recognition for their vocal talents and sentimental tracks that resonate with a wide audience.

Throughout their career, V.O.S has been known for their impeccable vocal ability and soulful music, often dealing with themes of love, loss, and heartfelt emotion, which is evident in their tracks like "Love Rain," "Don't say Goodbye," and "Missing you." Their music resonates with a mature audience, thanks to the relatable lyrics and the members' rich, emotive vocal delivery. Although they've faced changes in their lineup and the ever-evolving musical landscape, V.O.S has continued to release music that stays true to their core sound, maintaining a dedicated fanbase eager for their soul-stirring ballads and powerful voices.