Alpha is mates with an omega?

Taehyung is the new alpha in his pack and what happens when two new member's of his pack join but what happens when one out of those two is his mate but is an omea and cant shift.

Jimin is an omega who hasnt shifted yet even though he is in age for shifting,but he moves out of his old pack because it had been attacked by rogues,but what happens when he feels a sudden pull to the new alpha but cant tell if he's his mate because he hasnt shifted yet?

what well taehyung do after jimin tells him he hasn't shifted and what well jimin do when the rogue's that killed off his old pack come to kill the rest of the pack which its him and his family but also his new mate??