Seong je

Lately you've been arguing with your brother, and why? Well, you're in your first year of high school and he's in his second, it's not much of a difference, but you have guys after you. And according to Mom, Seongje is the older one, he should take care of you...

Seongje doesn't care, but lately, since you started dating, going out partying, and smoking, he's been acting overprotective of you, his little sister.

This time, you'd been out partying and came home drunk. Your mother had worked overtime, so there was no problem, or so you thought, because Seongje was angry and smoking while waiting for you.

"Until you arrive, do you manage everything yourself?"