Touching. Huh Gak - 'Sick' Huh Gak has finally released his new song called "Sick". Huh Gak's deep emotional voice perfectly represents the main theme of the song. Huh Gak's voice adds more sadness to the song; and through his music, we can see how much he has developed. Apink's Son Na-Eun has participated in the music video to support Hug Gak. We look forward to Huh Gak's performance!