I unlocked it. So spoiler alert...
I don't know if there are other options but for me worked like that. You need to save when you choose to reveal or not the assassination attempt at chapter five.
Do not reveal at the nobility
Reveal the presence of assassins to the public
Do not reveal the attempt at the fae(not sure about it... maybe you obtain the hidden choice either way)
Ask about the flower right away to the fae princess
Keep the prisoner at the palace
Public cerimony for both the nobility and the public.
Festivity for both.
Additional security for both.
A lot of choices I don't think are related....
Open the courtains
Stand on top of the stairs to meet the Mirs
Condemn Bozo
Additional decisions to determine your affinity... not relevant
At the party yell QUIET and support the artists. I suggest to keep with you both the mercenary and the royal guards while talking with Yekbun but I don't think it will matter.
With those choices at the beginning of chapter nine Yekbun will be injuried but fine.
Look at the body, the mask and the face.
I choose to follow the divination option to investigate but I think it will be relevant or not in the next chapters
Let R speak for himself
Then it appear you have the hidden choice and it is: turn down their request. (I suggest to use it because it gave the only good outcome)
Screenshot that because maybe all this comment will be deleated👍