@kuroageha You mean Hiiro. Hiiro is different, he's wary of everyone and only thinks of his own wellbeing first, he suspected even the Red Loli, and Red loli is a genuine philantropist.
Also all you need is to look at Judom's surprise during the piece talks to see that the King being deceitful was not supposed to be his nature. It's Judom we're talking about here, the guy who grew up with the King. And was trusted enough that the king himslef would leave the country in his hands if something were to happen to him before his successors had grown.
The king is not a bad person so it was literally impossible to predict that betrayal.
Look at this comment "Nevermind the the novels, comics, and anime where the king is deceitful, if they paid any attention to history class and even in modern politics they should be very wary of politicians/rulers even if they treat them well. "
Kings are not the same as presidents. Kings are grown into their positions and they have much more power than any modern politician. They don't backstab you like modern politicians because they can simply stab you in your chest and no one can say anything against it. So it's much easier to trust a King than a politician. More importantly, Ministers and Nobles are who you should be wary of, because they don't enjoy the same power and can always lose their position, so they'll be more likely to decive and backstab others to keep it. More importantly the story has already told readers more than thrice that the king is a good ruler trusted by everyone. Literally no one expected his betrayal, many of his loyal subjects were equally surprised as Judom, when their King was the one to break the peace talks. This shows that no his betrayal was never expected and his behavior was never deceitful. Also we do have scenes of Hiiro being paranoic, so his choice to not obey the king at the beginning doesn't serve as a proper explanation here.