
For those who read the novel...
Are there other bl couple?

There's no chapter about it. Just an overall feeling. XXC and SL trully had the potential to be the second couple but they never had a chance since XY interfered and they both ended up dead (sniff). I think that LXC treated JGY more like a cute little brother, the youngest much doted on sibling than anything romantic.

Nie Huaisang was supposed to have a right handman/lover, but MXTX's decided against it. Mo XuanYu was also gay, crushing on Jin GuangYao. But no other couples couples.
I on the other hand think that XY and XXC were a step from being in a relationship. XXC really liked the nameless stranger and XXC was one of the two people XY cared for (used to care or was at least protective of JGY). Same for LXC&JGY. Both LXC and XXC brought out the best in XY and JGY, but they all still ended up in tragedy.

True, but JGY is not usually the one to off people if they hadn't done him dirty first or were orders from his father. MXY's character is barely there, so it's up to us to interpret him and decide if the things said about him are true or not. JGY always keeps the kind facade up, so MXY liking him doesn't feel alien to me especially in the Jin clan where arrogance is top notch.

They change quite a lot in my opinion, but I heard Chinese drama adaptation usually change alot of things, some of them even couldn't be recognized by the original author (The untamed still considered loyal to the novel compare to the other C dramas they said, which surprise me)
Some other things they change is, there's no yin iron (only stygian tiger seal created by WWX). WWX is the founder and the first of demonic cultivation (not Xue Yang, not Wen Ruohan). Anddd ofc the BL heheheh ლ(´ڡ`ლ)

Correct. But why Qin Su? I think she legitimately killed herself by her own free will. JGY did love her a lot.
MXY could have stumbled upon something JGY didn't want found out. I think he definitely followed JGY, crush or not. Maybe found something he shouldn't have and JGY accused him of incest. Or another thing that crossed my mind was that MXY could threaten his position as a sect leader but that's kinda doubtful, ppl would actually choose JGY over MXY in this situation.
There are loads of possibilities but I do that my first as headcanon. I think this is much more interesting since we actually have discussions about actual content and characters. Kudos to MXTX

Oh wait, sorry my mistake about Qin Su part. It's more like, he drove her mad that she kill herself (he did something to controll her at the last moment)? Another possibility is, once he realize Qin Su might tell people about his secret he might as well controll her to make her kill herself in public.

Yeah. I think he put her under a spell to mute her or make her dizzy. Makes me wonder if she would have said anything and shamed herself in the process. I guess her suicide worked in his favour.
I still don't understand why her mother didn't tell her daughter about their situation. It should have been a dual burden, it's just terrible to put it all on JGY

I'm not sure, but I think it's hard to tell ur own children that they are birthed from rape, she doesn't want to hurt her daughter feelings. Another is, well, u know, it might become a trauma. Hence, she didn't tell it to other people (but in the end she told JGY). Another is, she doesn't want this secret to spread to other people, this will corrupt her daughter's and her reputation. And lastly because of the rape thing, she's scared of JGS.
What???!! a continuation?!