Kim Sun-woo (김선우; born April 12, 2000), known mononymously as Sunwoo (선우), is a South Korean rapper and singer-songwriter under One Hundred Label. He is a member the boy group THE BOYZ. Kim Sun-woo (김선우; born April 12, 2000), known mononymously as Sunwoo (선우), is a South Korean rapper and singer-songwriter under One Hundred Label. He is a member the boy group THE BOYZ.