King Donkey Ears

I read "King Donkey Ears" usborne first reading book, level two book.

Shhh! The king has a secret.
That the King has a Donkey Ears!
Everyone who cut his hair and know his secret were put into jail.
Will his best friend know about her secret?

First, I think that he is not a man or animal?
I really concerned about it.
And it was sad that a lot of people who know his secret were put into jail.
I've heard that the people who saw the king's face was killed.
It's very similar story.
But finally, thanks to his best friends, it was happy to free from the jail
and I think that the king was happy to speak freely and proud of his ears!