Yohan, the K-pop singer and member of the boyband TST, real name Kim Jeong-hwan, has died aged 28.

According to a statement published by TST’s record label, KJ Entertainment, and obtained by AllKPop, Yohan passed away Tuesday (June 16). The cause of death has not been confirmed, at the request of the singer’s loved ones.

“We are sad to relay the most unfortunate, sorrowful news,” the statement reads. “On June 16, TST member Yohan left this world. The late Yohan’s family is currently in deep mourning.”

Yohan joined TST (or Top Secret) back in 2017, having previously featured in the band NOM (No Other Man).

His funeral will reportedly take place in the South Korean city of Yongin June 18. Fans, meanwhile, have been leaving tributes across social media.