He is the first of the group to have to incorporate the army.
Jin, the eldest of the seven BTS stars, will begin his military service in South Korea.
All South Korean men under the age of 30 must perform compulsory military service for about two years, mainly due to the threat from North Korea.
And 29-year-old Jin is approaching the deadline.
According to the Yonhap news agency, which cites military sources, he will begin military service on December 13 and complete his mandatory five-week classes in Yeoncheon, near Seoul, before being assigned to "a unit in the first line ".
Jin will be assigned to the front line
The singer had already hinted on social networks that he would be assigned to the "front line", that is to say probably near the border with North Korea.
The news had shocked BTS fans.
A debate has long raged in South Korea over whether or not to grant the group exemptions from military service, given its contribution to the country's economy and culture.
These exemptions are already granted to Olympic medalists and high-level classical musicians, among others.
The BTS agent previously announced last month that the group members will do their military service well.
In August, the Ministry of Defense clarified that the seven boys could continue to play and perform on stage during their presence in the army.
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