
I kinda see Linus in Antisocial personality disorder, they didn't seem to have emotions towards outside stimulus until he saw Peter. Might've been projecting his lack of emotions onto Peter who wear his heart on his sleeves, but whatever it is he felt it for him, and for some with this disorder they're capable of feeling emotions or even empathy for the person/people they 'let in'.
I think that's one of the reasons he missed the signs of Peter growing weary of their relationship, he was too focused on 'their future' 'isolating him' 'giving the world to him' that the line snapped, first for Peter then it was for Linus himself.
His reasons are out of the world for sane people, he wasn't sane since the start anyway, our reasoning won't work to understand his character. And when he start to hallucinate, his delusions grows even more out of control and twisted.
When he was a child, he imagined destroying the world out of boredom, remember this point. when he felt love/obsession towards Peter, he vowed to kill anyone who hurt him, he hates anyone who so much as glanced at Peter, he hates the idea someone else fancying Peter. Now, he realized that he IS the one hurting Peter, that made him want to kill himself (but those attempts was put to stop by the doctors and people around him). But he also realized if he's dead, that won't stop people from 'loving' Peter, he hates that. Which gives him the idea, if everyone is dead then no one can like him, look at him, or have him. He have no qualms to really go through with that idea, after all the idea existed even before he knew Peter, their circumstance actually fueled his motivation. But that also means harming Peter, that also means hurting Peter since he knows Peter cares for other people unlike him who's unable to feel empathy. And that conflict birthed the delusions that if he can't kill everyone, at least Peter would be cornered enough to kill him, to end him, and positively remember him in whatever manners it might be. It was enough for Linus

Now kids, this is why minors shouldn't do relationship/sex, they could do the dumbest thing in the world and not realizing what they did wrong kekekekek. I'm not excluding myself when i said that, oh I've done my fair share of regrets I'm my youth and honestly question myself why tf did i do that??
Well, all in all it's all in the past. But for the less fortunate it could lead to serious harm, so be safe kids. Be an adult when you are an adult, have fun but take care!

I truly understand that feeling that Dan must be having, being scared of your loved one to pass, that loneliness yet also the heavy burden it comes with taking care of ailing loved ones. It's hard, it's hard on your body, it's hard on your mental. You don't want them to pass, yet it's so hard, and you feel guilty for even feeling that way and it circles around, spinning into madness. And when they finally passed, there's a relief, then comes the maddening regrets, and it stays for years. Knowing Dan, it'll hit him hard so hard I'm hoping his grandma will survive this. Alas, I don't think that's possible

That Gwang-gi dude sus af, I can almost say with confidence he's gonna be a two faced bitch. I mean?? He literally said, "you sounds textbook version" then said he's amazing?? Isn't in art being textbook version means you lack individual creativity or your own "colors", that's so weird.
Also him taking the credit for the stage idea? Shameless, whatever the reason you don't do that. You can try to voice out the idea FIRST, so it's unbiased, and THEN you can give the credit to it really belongs to, if you're a good person. He's giving me the creepy vibe istg
The first panel when i just started this one, I just knew it'll be a tough ride to read this one. There's seems to be a tell tale which art style gonna be a tragic story especially the cutesy ones I had my fair share of heartbreak. But thankfully despite the chaos and roller coaster ride, this one ended in a beautiful, happy note. And the ML is a whole green forest, I really really love that.