Pretty much all the girls MC marry is solved in happy ending.
Mingyue Gelou is saved on ch449 with usual face slapping style. If you're curious what happens in later part, she will have a child with MC.
LuanLuan + Jiange arc also done after eradicating the opposing clan. LuanLuan met her real dad and siblings. That grandpa Lin talisman guy also solved in the same arc with this.
Huang Qing and Chen Di are sister, real name Di Chen and Di Qing. Both ends up with MC as well.
Some of the ladies problem won't get solved until more than thousands of chapters later because the author just suddenly remembered to tie the loose end. Like Wushuang which pretty much ignored or Yiye Jiange copulate scene got delayed just to cocktease the readers. You might want to read it more but you will fall to author's trap because he will introduce more women and more problems. Rather than wasting time and get trapped, just stop after MC revenge to Yan family.
Examples of upcoming sh*ttiness because I suspect that the author was running out of ideas
which usually is moving/ascending into "upper" plane/universe
That's not how you write an open ending, not just by abruptly cutting it out before final battle. Even if you were to write couple of chapters of battle, couple of chapters about MC romance, then proceed to kill the MC, and ended it with his kids receiving the legacy and still keep on battling is a still better open ending, although sh*tty, than just cut it out before final battle and tell the readers to just imagine the ending and write '1000 readers... 1000 ending' like wise sage, what a charade
1. When MC met Lin Dong's daughter, she mentioned 'Uncle Tiger' but never ever appeared in the whole novel. Only the other brother appeared (If you have read WDQK)
2. Author mentioned only some of the previous novels children but only 2 of them appeared. Which one appeared? Can you guess it? Yes, the girls. The author could've made an interesting story with that and didn't. An awesome material was wasted.
4. Nine Nether had a bloodline link with MC! Life and death of 2 person matters for each other but there is no conclusion in that relationship. The author just made it that MC helped Nine nether getting the ancient beast and the relationship doesn't need any further development. Previous 2 novels' MC had 2 wives. The author planned the same for this but didn't deliver.