
Folks, this is a huge step forward, not just for the plot, but for Yona as a character. What she did is a hard, brutal, political choice. And the best one she could make. As Zeno, w/ centuries of wisdom points out, they have gained too much power to be left alone. If they run, they will be pursued and it will fracture the kingdom they have been protecting. They have to go forward.
No, none of this is Yona trusting anyone, esp Kye Sok. No, none of this means that she is bamboozled. She's just accepting what needs to be done and doing it like the BAMF she has become.
This is what plot momentum looks like as we head towards 200 chapters.

Although I don't like the idea - I agree. The saying "Keep your friends close and your enemies closer" (heard this first from from the Godfather) - they would basically be in the position that their enemies can't harm them directly, at the same time be able to gain more knowledge of any situation that may arise.
I think Hak knows this too, which makes it all the more frustrating for him. He'd rather keep her and the dragons from harms way and spare Yona any pain and sadness.
Yona has really matured from that little hapless lass to a bad-ass, intelligent princess.
Praise be to our lords, the givers of all good things