To be honest that would make things much worse. Especially since many readers don't like alternative endings, mainly due to readers preferring a "always meant to be" couple. Idk remember which series it was but there were two series one BL and Het that did that and so many readers absolutely hated it because it felt like the main couple weren't the main couple.
Forgot add that it will make each side say "see our ending is better" which will just cause another fanwar
True. But given how there's a constant argument with their favourite ships. I just think that an alternative ending would bring some kind of peace, maybe? Also your point makes a lot more sense if there's an end to one argument another one will follow soon after.
*the not their
Not a good idea as you would expect...
The only way to end the fan wars would be to give an alternative ending. In a way where Jooin ends with Yahwi in one and Cain in the other ending. It would defo resolve atleast half the fan wars thats happening regarding this manhwa.