Seo Min-woo of 100% died of a heart attack Sunday at the age of 33, group’s agency TOP Media has said. Boy band 100%’s agency announced the death of leader Seo Min-woo, better known as just Minwoo, through its official website.

“He was found at his home in Gangnam, Seoul. Paramedics rushed to the scene, who pronounced him dead,” the announcement read. Seo debuted as an actor in 2006 through TV drama series “Sharp 3.” He switched to pop music in 2012, as the leader of 100%. ()