Hello, as far as I remember there was only 1 couple, which is the guy with big yellow hair and the fox with red hair, they even have sex in one of the chapters. However, in my opinion, based on a graph I saw, it looks like there will be a love triangle between the one with gray hair, the one with short yellow hair and possibly the one with brown hair. I personally hope it doesn't happen, but from the graph it looks like it might happen in the future.
Oh, I forgot to add that even though the guy with the blonde hair and the fox with the red hair have somewhat obligatory sex to open the doors of the building, it's a little obvious that they like each other, and when they were kids they were together too, even though they are not officially a couple yet.
I was reading this story on a Korean website, I understood very few things and I'm really excited to start understanding this story once and for all and knowing exactly the characters' dialogues. Thank you for bringing this story and translating it!