Jung Ilhoon (; born in October 4, 1994), simply known as Ilhoon, is a South Korean idol, actor, singer, dancer, composer, lyricist, rapper and member of the South Korean boy group BtoB. He is well known for his multiple song featurings with artists such as Hyuna and G.NA and as an assistant MC in the variety show Weekly Idol. Ilhoon made his acting debut as he starred in the drama Webtoon Hero: Tundra Show on 2015. He was also known for popularizing the gestures for Gwiyomi Player.