In a statement, Tajoy Entertainment, Wheesung's management, conveyed their 'deep sorrow' over the artist's passing.
At 6:29 PM on Monday, Wheesung was discovered unconscious by emergency services, who were alerted by his mother.
Local police, responding to the incident, stated that 'a significant amount of time' had passed since Wheesung's death, and an autopsy has been requested.
This coming Saturday, the 43-year-old Wheesung was set to perform in Daegu alongside singer KCM.
Wheesung's final social media post, announcing the concert, read: 'Weight loss completed. See you on March 15.'