Kismet

Jeongguk, a 17 years old (soon to be 18) true/royal blood Alpha werewolf has got a big crush on his 20 years old friend Taehyung who is declared human. It was surprising for all that Taehyung didn't get the genes of a werewolf despite being a part of the pack since the beginning though his parent's identities are unknown to this day.
Jeongguk is worried whether he is going to find his mate when he turns 18 and that's not gonna be taehyung. Taehyung is in love with jeongguk but never confessed out of the fear of losing his love in the hands of fate at the end when jeongguk will meet his mate.
Both friends suffering on their own, dreading the unwanted future and it's course hanging over their heads completely unaware of the fact that they do not control their fate and kismet has its own plan for them.