The South Korean boy band TST was formed by JSL Company in 2017 and since then accumulated hundreds of thousands of views online and a mass fan base all over the world.
Yohan’s fans rushed to social media to voice their grief at the passing of their favourite vocalist.
Yohan has been recently active on social media, with his last Instagram post appearing on 31 May, showing the singer in different locations and captioned with "I want to travel."
The band's agency issued a statement, in which it expressed sadness over the news and called on the media to "refrain from spreading rumours and speculation on Yohan’s cause of death."
Yohan gained popularity globally, alongside his bandmates Ain, K, Wooyoung, Junghoon and Yonghyun, as well as Kyeongha with hits She, Mind Control, Love Story, Paradise and Wake Up.