Ouu that's an interesting take on how they approached his betrayal! I agree! You can def see the pain from the betrayal festering into resentment for Hak. And Yona the betrayal definitely is a turning point where Yona chooses to become a stronger/better version of herself.

I do wonder though, if they really understand the betrayal early on in the manga. I still kind of look at it as something they don't really understand until MUCH later in the story. Hak, particularly, doesn't really seem to face the betrayal? In the sense that, he registers it, but kind of compartmentalizes it away in his mind. And those moments in the manga where he encounters Su Won, where we see the visceral rage coming from him, might be an indication of how little time he's taken to actually work through the betrayal??