The vocalist of boy band 100% died from cardiac arrest in his home in Gangnam, Seoul as confirmed by his label TOP Media.
"His family, the 100% members, and the TOP Media artists and staff members are all grief-stricken and in mourning from the unexpected, sad news,” the statement reads.
Minwoo has been the leader of the five-piece boy band since they formed in 2012.
He was most recently featured on the band's Japanese EP Song For You in February, and appeared on the 2017 Korean television reality series, The Unit.
The Korea Herald reports that 100% is scheduled to perform several dates in Japan over the next month but it is unclear if the shows will still go ahead.
Our thoughts are with Minwoo's family, friends and fans at this tragic time.