If my memory serves right, Rin is Kaoru's fated pair and Taiga is Yuka's...
In the end, Kaoru and Yuka are together and have a boy named Mirai.
Taiga falls in love with Rin, however Rin loses his memories due to the high dosage of medicines to control the heat. But they end up together.
In my opinion, I think it's worth the read.
You know what, I felt the same way as you back when Rin got introduced, but I forced myself to keep reading and voila, it's one of the best omegaverse I've ever read in my life..
A bit of spoiler below!!
At first I really hate when Rin came like bitch don't you dare disturb Yuka and Kaoru, but now I understand why he got so fixated on fated pair (guess what, bcs Taiga always said that fated pair is the one who won't betray you bla bla bla yada yada ) and in the end he became this sort of pitiful character (alongside Taiga) bcs of his past overdose history of his heat suppressant (guess what again, it's bcs Taiga won't take rut suppressant
Okay, so I was on chapter 8, when Rin appeared. Then I screwed myself over and said "I'm gonna be pissed if Rin is Kaoru's fated pair and that dick is actually Yuka's fated pair".
AND WHAT DO YOU FUCKING KNOW Σ(っ°Д °;)っ
So, I need someone to tell me what happens because I'm so pissed I can't think straight. [Yes, I'm one of those people who don't like twists like this]
I can't bring myself to read the rest of it when I know I'm gonna hate it, so somebody please tell me what happens and maybe I'll read it, idk.
What makes matters worse is the fact that in chapter 5, even though the ending was "happy" I got this feeling of impending doom, and whaddya know the doom has come
I'm so feckin triggered.