Currently the BTS tour is still postponed. Per StubHub's policies that means you are in limbo. If the concert ends up being rescheduled your tickets are good for the new date. If the event ends up being cancelled then you will receive a refund or credit voucher based on which state you live in.
That is a question to ask of the BTS and their promotors. I had tickets for Styx and the event has been rescheduled twice and now postponed again. My guess is that BTS does not to reschedule the event and then have to postpone again.