It's not like he wants to but it's like he has too, his whole life was being prepared for him to take the throne(whether he like it or not) and that the fact that his relative wants it to add the pressure. Sadly that is the case for him.
Mil doesn't want to be apart of politics and he doesn't want the throne. Elise's partner (forgot his name) will kill Mil's family as revenge if he gets the throne. To protect his family, Mil has to kill his brother and receive the throne.
Thank you for understanding
" i don't understand how could they do that to thier blood relatives " yet he's going to kill his brother . Pick some thing one . （￣へ￣） （￣へ￣）