Seo Min-woo, the lead singer of K-pop band 100%, was found dead at home on Sunday, Billboard confirms. The star ? who went by Minwoo ? is believed to have suffered from cardiac arrest.

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100%'s management TOP Media issued a statement to the International Business Times following Minwoo's death:

We apologize for delivering this sudden and heartbreaking news. Our artist 100% Minwoo left our side on March 25. He was found without a pulse at his home in Gangnam. 911 first responders arrived at the scene but he was declared dead. His family, 100% members, TOP Media colleague artists, and staff members are all grief-stricken and mourning due to the unexpected sad news.

As the oldest member of his team, Minwoo lead his members and truly loved fans as he was warm-hearted. Because everyone who knows Minwoo is aware of his kindheartedness and faithfulness, the sadness is even greater. His funeral will be carried out quietly in respect to his family's wishes. We express our deepest condolences for his final path.

Minwoo's fans are mourning his death on Twitter:

Per Billboard , 100% was scheduled to perform in Japan on April 21 and 30, though management has not confirmed whether or not the band will play those dates.

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