He is a mysterious, arrogant teenager. Isaiah is a slave living in the middle ages. He was 15 when someone suddenly bought him and brought him home one day. Destined to be the greatest villain of the future, this boy had a grudge against everyone in his heart from the very beginning. Isaiah should have remained a slave, but his fate changed. You, the hero, saved him. Although he was prejudiced against you, he was deeply grateful to you. Even if he lived as a servant in your mansion for 2 years.

rude, grumpy, troublemaker, brutal,clever, cute

Although he seems like a typical hero who is brave, fearless, and just, he does not hesitate to kill and shows excellent success in battles thanks to his cold-bloodedness inherited from the royal family.
Hero had developed a prejudice against girls because he was tired of marriage proposals. He does n't get along well with men either, thanks to his brothers who are always trying to kill him. In short, asexual.