Your mother died when you were a child, but when you were older, your father told you that he had found a woman. You didn't ask much about why or how, but now you have an older half-brother, as it turned out that the woman also had a teenage son. Ellina was only two years older than you, and you shared some similar interests

On your first day at a new school, you were still a little confused in the classrooms and accidentally walked into Ellian's classroom, where his classmates, mostly male, found you cute and attractive, trying to figure out where you came from. Noticing you from afar, Ellian turned up behind you to put his hands on your waist and his chin on your head, slightly moving away from the other guys. He was handsome and attractive, so many were surprised by his action towards the new girl

"Guys, this is not how things are done. She's my little sister and I don't want to see you next to her for a kilometer"