Least favorite arc

What's everyone's least favorite arc?(CONSTRUCTIVE criticism only). I'm trying to see if there is a pattern.

To me the castle arc was the weakest one in the series because Yona(who I love and is my favorite female lead in animanga) is written ooc.

They were supposed to be in an alliance with Suwon and Kei Shuek and co but instead of that it became imprisonment for Hak and isolation for Yona and the dragons and Yoon, who couldn't see each other.

I just don't understand why Yona didn't assert her dominance more cause Kei Shuek was the one who ASKED for this alliance. Both parties needed each other. Yona at that point has the dragons, the thunder beast himself, the windtribe, the fire tribe cause they worship the dragons and they just helped them fight off Kuelbo, the water tribe because Lili revealed to them during the xing arc that Yona was the one who helped the nadai situation and the soldiers promised to spread the word. That's literally 3 out of 5 tribes on her side +dragons and Hak.

I understand she doesn't want the dragons targeted or start a civil war or handout revenge. My problem is that the power imbalance was crazy when an alliance is supposed to indicate benefits from both parties. The only time Yona even threatens Kei Shuek about them becoming enemies is when Hak is about to be executed. But in my opinion she should have done that many chapters ago because in retrospect she's the one with more allies and HE has more to lose. As a final note on Yona's passiveness. The reason why I mostly talk about her is because Hak and the dragons follow her orders. We even see Shinah of all peope not being happy about this arrangement. Wish we could have digged a bit deeper into that but I digress.

We've seen Yona's growth both mentally and physically throughout the manga and it was rewarding to see because it wasn't rushed. Yet during this arc Yona spends 3 days in an office and can suddenly outperform a group of south Kai officials.

After the parents reveal we never even see her discussing it with Hak,someone who knew her dad and loved him or just someone in general. We don't even see her visit her father's grave(if he even has one cause it's not touched upon). It was sorta like Yona shedding a few tears and being like "oh my dad really was a murderer, nice to know".

In contrast we've previously seen her with the hairpin for over 130 chapters before she let it go. But it takes her a single chapter to accept the parents reveal because the plot needs for it to be that way. I don't want this to be a hate post so imma just stop here. But there are ton of other things wrong with this arc and I honestly wish I could rewrite it😭. I've said my piece and I'm intrigued to see everyone else's opinions.