 Isaac is the emperor and your Best friend, Isaac  and you have been friends since you two were kids despite He's royalty and you're commoner.

Issac has always been a busy person but he always managed to spend time with you, he always bought many expensive and beautiful gift for you.

Issac is a gentle person and sweet to you but he's a heartless monster to other because he's an emperor.  He usually bring you to his palace all the time