
This is super simplified for anyone confused about the politics, basically the king's younger brother (official in purple garb heretofore known as Purple Man) who first comes to seek Heeryang out was concerned with the threat in the north and wanted to eliminate it, but was meeting opposition from politicians who were suspicious of his motivations. In order to secure the borders and do what he thought was best for the country, the Purple Man ordered Heeryang to eliminate the dissenting politician (MC's father if I'm not mistaken) in order to make the other politicians fall in line and agree to securing the borderlands.
After the campaign in the north succeeded and security was returned to the border, the border lords who are probably like feudal lords of fiefdoms a little like Japanese daimyos I imagine though maybe lesser ranked, being militaristic and survived on military campaigns and battles no longer had much purpose since there was not a great need for them. These border lords started raiding/pillaging the rural towns and basically started eating into their own nation's resources creating a new problem for Purple Man to try and solve. In order to squash this new problem Heeryang was employed to sow mistrust and fear among these lords so that they would start being suspicious of themselves and their compatriots turning their focus to in-fighting.
This is what I gather from the snippets shared. Feel free to correct any misunderstandings to help people get a clearer picture!

I feel for Hanjoon, he's just come out of a relationship with someone who basically used him as a human comfort pillow and wasn't invested feelings-wise, granted he chose that for himself but I think he always expected Jaeha to reciprocate eventually. Now I can understand why he doesn't trust someone who is young and not exactly reliable (Jin), even though Jin seems to be earnestly pursuing him I don't see him as being genuinely invested and at this point I think Hanjoon is looking for long-term commitment.

Is it just me or did the pacing just stick a bunch of rocket fuel up its own ass and set itself on fire? Like the last couple chapters we have more hate-fucking then suddenly everything's coming together for an extremely rushed ending. Maybe it's just me, but it's like the author shined the Thundercats call and now everyone's charging in to save the day.

TJ is just super destructive when it comes to Ian and I personally don't like that they're stuck together like magnets, but I get that they formed a bond because of what they went through and how long they've known each other as well as their gang affiliation, but they're not good for each other even if their intimate scenes seem to have more passion and chemistry. I think something bad's gonna happen to Ian, and perhaps Jo will be left picking up the pieces, who knows. There's also something up with Jo's development since it's shown that he comes from a background that suggests he had to conform to some sorta toxic masculinity standard going by his dad and the whole hunting thing, otherwise why bring up the revolver schtick. I dunno I have a feeling there'll be a significant twist coming up, at least that's what the story needs right now.
I'm not a fan of pushy third wheels in yaois so this chapter kinda gave me the ick. And for the record I am an old school yaoi connoisseur as well as an enjoyer of newer stuff, this type of casual butting in-dome is just annoying to me in characters.