She is barely even close to him. She’s been in a tower for 18 years and he’s pretty much like a stranger to her. There’s a difference between irl family bonds. This is about royalty in a comic, pretty competitive to take the throne and lots of comics with royal families have a lot of bad blood between siblings. It’s not uncommon for siblings to kill each other over the throne.
Yeah I understand what how you feel, even I feel bad for the brother. I can’t really remember the chapter well, but I do remember him being tied up. I don’t really think he would’ve been tied up for the things he said in the past, he might’ve been tied up/punished for something he did to her. We didn’t really get the full info of what happened.
Umm did she killed her brother?! Isn't that too cruel ...idk i feel like she's a bit too cruel tbh if she gone that far