Kim Hak-chul, better known by his stage name Kim Yeon-woo is a South Korean male singer, vocal coach, and professor at Seoul Art College. Nicknamed God of Vocals, he is well known for his ballads, smooth singing voice, and ability to hit high notes without difficulty. Kim recorded a number of hit ballads with the South Korean band, Toy, in the mid-to-late 1990s, gathering a sizable cult following. In 2011, Kim achieved widespread fame and recognition in South Korea through his participation on I Am a Singer, along with numerous appearances on variety and entertainment shows.