The boy group has gone "All In" and completes the line-up for next month's concert.
The entertainment agency issued a notice to BTS fans to please be more mindful of their actions that could hurt the idols.
The two will star in the second installment of the series, called "Cockroach."
The band's last Korean album was released in early 2015.
Only four members were not included in the group's first ever sub-unit.