
Did..Did the author just give an excuse for the ex-girlfriend for cheating!!!
Honey you feel lonely?? Go fucking break up with him!!!

Huh. You're missing the point. Whatever is the author's opinion about cheating, the author just simply explained how Shizuma's personality and brain works. As a partner, he evaluated himself how he treats his partner and make corrections. By no means Shizuma says cheating was fine and justified, he was just taking accountability that he was partly at fault.

Ohh boy they’re falling harder~
It’s gonna get ugly in the future
here is my theory: the uke will decide to pursue his revenge and the seme will let him do it out of love, then the uke will run away thinking he killed the one he loved but the seme didn’t actually die so when he get better he will go to look for the uke AND THEN…Idk that’s all I have ╮( ̄▽ ̄)╭

My theory is nearly the same as yours but both of them will die in the end. Yeonjo will likely take his own life after ending Hye Ryangs (as he said in his plan) since he'll probably be sentenced to death by the emperor anyway for killing a valuable and high ranking official.
But as this webtoon has no tragedy tag, story might be unlikely to end up with this type of ending, probably unless a reincarnation scene will happen afterwards so they get their happy ending in the modern times instead.

But I still don't think that uke will actually be able to kill the seme. When the right time come he will realize it is just too hard for him to do so . Or it could also be turn like heerang knows that uke will kill him and he is letting him do so. But once uke gets to know that seme already know about his intension he will feel bad or something . OK now I should stop with my theory

Yes that is a possibility but imo it'd be nicer if he goes through with his revenge than backing out because it brings more dramatic impact to the story.
Again, as I stated, it is unlikely that my theory will happen since there is no tragedy tag. So this whole theory of mine is merely wishful thinking.

UGH those bitches!!!!
Like the audacity to take a pic like a fucking stalker(⊙…⊙)!!

In Japan/korea it's pretty much normalized to take pictures without permission and women are primarily guilty of that but like men take underskirt pictures of women too. It's super scummy. Fun fact, east Asian phones are required to have a shutter noise on their set and it is not silenced even during silent mode. They are trying to stop that now
Daddy is standing on business today