Good theory. If Soo Won were to die then, that would leave Yona on the throne. And the Yona from the beginning of the story would have been a puppet for corrupt officials.
Oh my god and he already said that he wasn't going to be a king for a long time
But like why kill the king and cause tremendous pain to Yona. What if he killed him because Soo Won wanted to drive her out of the castle. So, that she does not have to suffer the consequences of being being a royalty and King Il decided to agree with it.but like ughhhh
I think Soo-Won gonna die cause of how sick he appeared and the fact that he doesn't want a wife and already decided on a successor.
Remember back when Yona wanted to marry him but her father refused and she assumed it was because they we're related but what if it was actually because he knew that he was sick