Daesung has been belatedly revealed to have been hospitalized.
SportsKH reported that Daesung had been hospitalized at the Chuncheon Army Hospital. The hospital confirmed, "It's true he had been hospitalized. He's been discharged now". However, the hospital did not disclose any information on why he had been hospitalized because that is private information.
Daesung enlisted this past March 13th. Hopefully he's recovered well now.