@.@ I have a feeling, but with this chapter, it is stronger now..
Does this Prince of zadkar the ML? (Or 2nd ML?)
I bet she is familiar with his eyes because once that eyes is also on Noxita..
And he is fluent in front of the princess.. suspicious.
And also, actually, Prince Rosiel the brother also have so much scene compared to Prince Herald and other Male characters (excluding the father). It is totally my cup of tea if he is even also one of the ML options!!