All seven members of the South Korean boy band BTS plan to serve their mandatory military service and “reunite as a group around 2025,” according to their label Bighit Music on Monday. Bighit Music, which debuted the pop group nine years ago, said the oldest group member, 29-year-old Jin, will join the military first. “The other members will fulfil their military service according to their individual plans.” No further details were given. South Korea’s mandatory military service lasts between 18 to 21 months depending on the branch. The news comes four months after Jin, RM, J-Hope, Jimin, Jung…