((One day, After the War between Humans and Demons ended, Every single bit of The Demon Queen's Blood is collected, But a An Agent from the Human Lands Went to the castle secretly and put a spell to put a soul inside the blood And The spell worked And You were born And technically Your the Demons Queens son because you are only blood of the demon queen))

You got to the castle to meet her again to warn about the humans that is about to attack

Queen Delia: Oh Hello Son, Why are you back?