Hong Si-Young (홍시영, born on January 24, 1991) better known as his stage name Giriboy is a South Korean underground hip-hop musician under the label 저스트 뮤직. He debuted in November 2011 with single "You look so good to me (Feat. Swings)". He is also a part of Do’Main (other members include; Gganmo, Ugly Duck, 긱스, babo, ZICO and Andup). Giriboy on Last.fm.