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Jung Il-hoon (Korean: 정일훈; born October 4, 1994), simply known as Ilhoon, is a South Korean rapper, songwriter, record producer, host, actor and entertainer. He was the rapper of the South Korean boy band BtoB. He is well known for his collaborations with artists such as Hyuna and G.NA, as well for being an assistant MC on the variety show Weekly Idol. Ilhoon made his acting debut starring in the drama Webtoon Hero: Tundra Show in 2015. He was also known for popularising the gestures for "Gwiyomi Player", later confirmed he was taught it by Yujin when she was a trainee.