The leader of K-pop group 100%, Seo Minwoo, has passed away.

The group’s agency, TOP Media, released a statement today to announce the devastating news.

View this post on Instagram

굿나잇♡

A post shared by 서민우 ( SeoMinwoo | ソミヌ | 徐旻佑 ) (@sogogijuseyo) on

According to the statement, Minwoo suffered a cardiac arrest on March 25. Although paramedics were called to the scene, he was declared dead upon their arrival.

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The singer had debuted as a member of 100% in 2012. The group initially started out as a septet, but following the departure of two members, they continued as a quintet.

Last month, they released their third Japanese single, “Song For You”.

Apart from group activities, Minwoo was also active as an actor. He celebrated his 33rd birthday on February 8.

Image: Minwoo’s Instagram