You don't have to be a liar, because you can like people as you really are.
For the first time, Agatha and Tedros met in the forest and they fell in love. But Tedros didn't say to Agatha that he was the prince...
Then, they met again at the ball of the king and Agatha discovered that Tedros was the prince and Tedros thought that also Agatha was a princess, but she wasn't a princess: she used an old dress of her mother to be more beautiful.
At the finally Agatha revealed to Tedros that she wasn't a princess; but Tedros wanted to marry Agatha. Later Tedros became the king and Agatha the queen.And they lived ever happy.