Jung Yoon-hak (Korean: 정윤학) is a South Korean actor, model and singer. He is the leader of Supernova, and member of its sub-unit Double Ace, along with fellow vocalist SungJe. He is known for his lead roles in My Unfortunate Boyfriend, Bouncer and Ichijiku no Mori.
Source: “Jung Yoon-hak”, English Wikipedia (CC BY-SA 4.0), excerpt