Kim Young-hoon (김영훈; born August 8, 1997), known mononymously as Younghoon (영훈), is a South Korean singer-songwriter and actor under One Hundred Label. He is a member of the boy group THE BOYZ. Kim Young-hoon (김영훈; born August 8, 1997), known mononymously as Younghoon (영훈), is a South Korean singer-songwriter and actor under One Hundred Label. He is a member of the boy group THE BOYZ.