Yoonhak, born on December 2, 1984, is the leader of the South Korean boyband "Supernova" (known as "Choshinsung" in Korea and as "Choshinsei" in Japan). His stage name is Spica Yoonhak.
On late 2010 he couldn’t take part in Korean drama "Sign" together with his bandmates (as "VOICE" member), because he was busy filming "Love Kimchi".
After his enlisting on October 25, 2011, he has been discharged from the military service on July 24, 2013.
At the end of January 2014, he released his 3rd Solo Japanese Single "Kimi no Subete wo Aishiteitayo".
He landed the role of Young Ho in the Japanese movie "Ichijiku no Mori" (expected release date: June 2014), based on the novel of the same name written by Mariko Koike.
(Sources: Wikipedia, AsianWiki)