The Chosunilbo JNS/Imazins via Getty; Han Myung-Gu/WireImage BTS is officially on hiatus ... enlistment in the South Korean military on Monday, one day before their bandmates Jimin and Jungkook ...

The last four members of South Korean megagroup BTS who have yet to undertake their mandatory military service have begun the process of enlisting, the K-pop stars’ label said Wednesday.