Theory 2:

So I was just thinking, if Yona overthrows Soo-Won and takes her rightful place on the throne, I can't really see Hak becoming a king. The thought is just absurd. He isn't suitable because he doesn't have any knowledge regarding politics, diplomacy and generally about ruling, and he doesn't seem to be interested in any of this either. Moreover, he's a warrior through and through and belongs on the battlefield.

And if we think about it, Yona isn't suitable for Queen either. Don't get me wrong, I love her, especially the way she has developed throughout the manga, but don't forget, she's only a sixteen year old girl, and she also doesn't seem to have much knowledge about ruling either. 

That leaves us with only one possible outcome; Yona forgiving Soo-Won and letting him rule the kingdom seeing how good he is as a king. And even if she doesn't forgive him, she'll have to realize that Soo-Won bought the five tribes together, and prevented the kingdom from falling into ruin, and there could be no better king them him. Moreover, we still don't know Soo-Won's true intentions for murdering King Il, so there is still a possibility of this happening.

But where does that leave Hak and Yona?

Well, regarding that, I was scrolling through a few blogs and the internet, and came across this : Hak and Yona marry and live together with the wind tribe, a nice peaceful life in a village. Yoon finds a partner too and they occasionally travel around the country, helping those in need, (do I need to mention the fate of the four dragons? T-T), while Soo-Won rules as Emperor of the kingdom of Kouka. 

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Well, what do you think? I, personally, have a hard time imagining Hak and Yona living in the village, in fact, the thought depresses me a bit, but it's still better than imagining Hak and Yona as King and Queen (I'm sorry but the thought is just absurd, Hak is a warrior!) I'd love to hear your thoughts on this! ❤