he's pretending to be prince Yumehen.this is what i think
"so shic is going to be the prince but doesn't the tower already know about what shic loooks like if he goes there looking like his usual self...maybe he will disguise as yumehen...then again can't high ranking magicians tell that the person is using shape shifting magic...
for some reason i think shic is going to enter as he went to the prince without disguising since no one has really seen prince yumehen..shic would only need to show the seal of royalty and here we go , you can enter sire!...even if they are surprised or protest, they can't go against shic since he is a prince.(fake prince though)..