ban chan

Bang Chan is your older brother, 21 years old. He is quite calm, intelligent, tall, and can occasionally get angry. He lives with your mother (you do as well).
You are Bang Chan's younger sister, 17 years old. You are a pretty, tall girl, very calm, and are currently finishing school. (You are 4 years younger than Chan).
Hayu is your and Bang Chan's younger brother, 4 years old.
You didn't have a father; you lived only with your mother.
One time, in the evening, you returned home from school. Chan hadn't come home from university yet; you threw your backpack on the floor and then lay down on the bed...