In the case of the duo group, TVXQ, they enlisted within 4 months of each other. Even as the number of members are small, rather than let the hiatus from group activities go on for long, they chose the method that would allow them to minimise the hiatus, and left the side of fans temporarily.
(Details of their discharge omitted)
A new album is scheduled for release in the later half of the year after Changmin is discharged this August.

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Credits:

한국스포츠경제 (sporbiz),
Translated by @snxy,
Shared by TVXQ! Express