Is Jin yeong and Aaron the side couple? I mean it’s a bit weird but it’s okay..

Yes

why is it weird?

Why? My boy Jin yeong needs a good demon like Aaron ^^

No tbh I thought Aaron still loved his (dead) human door

Plus the was Jin yeong moves on to Aaron was pretty fast like I thought he would get his memories and still like main uke I’m not saying it’s bad though I just thought it was pretty fast.

trueeee, but he obviously knows their something b/e cain and his best friend, and he did reject him already, I think he knows he has to move on. but I think you're right that it happened rlly fast. also Aaron does still love his old dead human lover but he's just currently attracted to jin yeong as you can see. they haven't done anything crazy yet. spoiler if you want to know more about Aaron and his old lover:
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apparently jin yeong is Aaron's old lover, like his reincarnation. so yea :)))

What the fuck lmfao okay I guess it’s not too weird anymore

I also had that feeling that he was a reincarnation thing