@umjen He was being possessive when the reporter made Aileen a home/job offer if she was ever cast out. Of course when she pointed out that there is no way the Demon King is that petty he cut that right out.
So the heroine was the final boss all along X3 she is more fitting to the demon king ...it remind me when he laughed at the villainous and said now he feel more fitted to be demon king I laughed inside of me ...now what he will do when he see the heroine evil laughing XD