*as for number 5 turns out it was to study the relationship between guwon and the hounds. Yet the way the mc concludes it is not the best. Yes the hounds would ride guwon until sunrise yet in the end they are still humans with their own minds, as to say we don't really know why the red-head was close to pulling the trigger on guwon. It could've been jealousy (of the mc) or a built up grudge? And in the end we can all conclude that unless the hounds play a big point on the plot,the hounds are here to gain the favor and likeness of guwon no matter their own mindset or opinion on him. ᯣ_ᯣ
I can hopefully sate your curiosity!! Okay, let's start with 1.
1. We don't yet know the full story. We know that Mc and his dad were out possibly scavenging their old home when guwon came. Its possible the dad was already dead by some robber as Mc was hurt before guwon came. Mc asked guwon if he killed his dad but I'm unsure if guwon gave a legitimate answer.
2. At first, guwon saw Mc as like a pet. That's why he threw up after kissing him. It was after they did the devil's tango that guwon became a bit obsessed. I would like to say he's simply infatuated, and maybe a bit obsessed as Mc did show him things he's never been shown before.
3. As far as we know, they simply want to kill guwon for revenge and to live peacefully. They don't actually have a legitimate plan or course of action of how to do it and what to do after.
4. We don't know. As far as we know, Guwon is human but with psychological issues that make him more violent and less human like in terms of mental and emotions. He's also not smart so he could also just have a severe learning disability or bad childhood. But that's all speculation but as of now he seems human.
5. The main reason Mc joined the hounds was because they were an obstacle in killing guwon. Mcs job was to find more of how they worked and hopefully find one to help kill guwon.
As for why red head tried to shoot guwon, it's simple. Red head risked his life for possibly years for guwon and some random guy comes in and suddenly guwons attention is all on him. No matter what red head did, Mc was always above him. He was probably angry and jealous, wanted Mc or guwon to just die.
I like to believe that Mc was a total boss before he lost his memories and that's why he's having difficulties and attacks guwon. Idk though. I hope this was helpful.

I understand the possibility of the MC being crazy, and guwon (MAYBE) isn't behind the father's death. Ok easy because we can back that up with the MC's constant blanking out, attempts of harming guwon in his sleep (yet you can argue that he's doing that as revenge or self defense), and personally switches.
Ok but this second plot point in the story is a bit more confusing, the doctor was revealed having a grudge and a conflict against guwon and we see guwon more as a monster, the doctor dies and the MC and another character who was close with the doctor is wanting to avenge him. (And for the mc it's vengeance for his father and the doctor) . The Mc who is closest to him is manipulating guwon and seeking to kill guwon(?).
The third plot point is where I truly start to get confused, the Mc is with the hounds who are on guwon like stink on ass. One of the hounds find interest in the MC during the scavenge and another one doesn't (red head) who was earlier punished for having issues with the MC (by guwon), so here we see the horrors of the scavenge yadda yadda scary guwon, someone dies, the red head gets killed by the dude who was interested (most likely to please guwon) and we are left with the mc being threatened with a knife by the dude who was interested in him because it seemed like he was connected to the doctor. Boom! So now we ask and find our selves with a shit ton of questions
1. Is guwon the Mc fathers killer? Or is the mc just crazy?
2. Is guwon even interested in the mc or just Infactuated?
3. Like what's the end goal with revenge on guwon? (it may was said but I forgot)
4. Is guwon human? What is guwon?
5. What is the purpose of the MC being a scavenger? What does it reveal what we already haven't found out?
And a lot of the confusion stems from the lact of different POV's in the story! Since the Mc has his moments of blanking out and we aren't even sure if we can rely on his side of the story anymore, it causes a few plot holes!!! (╯°□°)╯︵ ┻━┻