This is literally one of the best explanations of the story! The part where you mentioned that without Jun's inner monologue, his actions could be interpreted differently is exactly what the authour intended to do I think (I never realized until you pointed it out!)
As someone who read the novel, I would say it's not the plot itself that's interesting or the best part of the story; it's the characters. Genuinely have to applaud the authour, the characters (both Jun and Yohan) are like onions. The more you peel, the more you see the inner layers and realize everything is not as it seems. You may not see how "fascinating" Yohan is right now, but to me he was very interesting to observe and read about.
Trust me, you'll see what I mean in the future chapters (I hope the manhwa does the novel justice! The art definitely does, hope the essence of the story translates properly as well!)
I hope I didn't spoil the story for you or anyone reading this（/TДT)/
The story is interesting, and I like the initial premise of Jun being the peripheral narrator, with his narration describing the setting around him and the characters who fill the background around him. It starts off as if he's witnessing a toxic bl romance unfold between Taesan and Junwoo, and his thoughts regarding what he thinks of them are very interesting. Which is why I feel as if a mountain will come crumbling where he's initially placed as an outsider but gradually growing higher on the social ladder as his relationship with Yohan progresses.
To be honest, Jun and Taesan are mostly the only characters that I like. Taesan, who seems like the typical damsel main character in a BL that ends up with the abusive male lead, and Jun, who hates Taesan and what Taesan represents: a lonely victim of bullying, someone that Jun does not want to be.
Jun's monologuing is the highlight of the story for me, and I love the contrast of his thoughts to his actions. If you remove all of his thoughts from the manhwa, you'd interpret his character way differently than with it.
Now my thoughts on Yohan are probably controversial. He honestly doesn't interest me. He started piquing my interest towards the end when he takes Jun to his house, but we'll see how it goes. I just felt like their relationship was pretty boring. I can see that this is going to take a direction where he'll be manipulative towards Jun, and Jun will probably be receptive to it given that he doesn't want to be where Taesan is currently in. Idk, I care more of how Yohan will impact Jun more than Yohan himself. I feel like the story is trying to push me into thinking he's mysterious and unpredictable, but the signs were all kind of there.