Seo Min-Woo, lead singer of the K-Pop group “100%,” died from cardiac arrest at his home in the Gangnam district of Seoul in South Korea Monday. TOP Media, which was founded by K-Pop star Andy Lee, said Min-Woo’s fellow band members, his family and the company were in mourning. His funeral “will be held quietly, according to the will of the family,” said the statement.

Min-Woo was the oldest member of 100%, the band created by Lee in 2012, and acted as a mentor and “brother” to his bandmates, TOP Media said.

“100%” has released four single albums and four EPs in Korea and Japan since they formed. They had just released a new track, “Song For You,” in Japan on February 14.

Former “100%” member Woo Chang-Bum paid tribute to Min-Woo on his Instagram account early Monday morning. He captioned a picture of the group: “May the souls of the deceased refrain. I hope you are comfortable in the sky. I want you to be a bright star and shine this world.”

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Before becoming a member of “100%,” Min-Woo was best known as an actor, appearing in South Korean television dramas Sharp 3 and The King and I. In March 2014, he took a break from the band to enlist in mandatory military service in South Korea. He completed his 21-month service as a soldier in December 2015.

Min-Woo’s death follows the death of another K-pop star, Kim Jong-Hyun of the band SHINee, in December. Jong-Hyun, 27, had committed suicide.

ERHS junior Cher Wang, a K-Pop fan, expresses her thoughts on the matter. She says “It’s a pity that he died so young,” adding that “it’s a tragic event.”