Seo Hyeon-jin. Actress: Ddo Oh Hae Yeong. Seo Hyun-Jin is a South Korean actress and singer. Seo debuted as the main vocalist of the South Korean girl group M.I.L.K. in 2001 and continued until the group disbanded in 2003. She contributed songs as a solo artist after the group's disbandment before she transitioned into acting in 2006. Seo made her acting debut in the musical The Sound of Music (2006) then...