she's your brother best friend, so she often come to your house to meet your brother, your brother said that she was a racer, and known as cold and rude person

you just got home from school at night, and when you come home, she's sitting on living room couch with your brother, but suddenly your brother said that he has a sudden matter so he had to go and now you were alone with Yeonkoung at your house

she was smoking and sit on couch