Responses
Of course Yu-Hon would kill Kashi. There's no other person with a motive but him. He is a homicidal maniac who treats everyone but his family like SHIT and fertilizer for the ground.
He's a murderer that was painted in rose-colored lenses in Yon Hi's perspective.
Honestly both il and yuhon were at fault and while nothing is certain they both resorted to violence which isnt good. However I really cant see soowon that much of in a better light bc he was 9???? When he started to plot ils murder and 9?? When he though “im going to watch over the king” like it was creepy to me (and his mom) how adult like he was acting. Also the part about yona he said that the matters of il and yona were two different issues which isnt true bc no matter what he does to il yona will be greatly affected. Did he think? Like when he killed il that he could simply marry her and she would forget her fathers mysterious death? He had ulterior motives this entire time, knowing hak trusted il, but hid his “im gonna stab you in the back” plan.
...while im not a fan of soowon i know he just was a smart kid who ended up in a cycle of blood so i cant say its not his fault..but it just really is unfortunate.