☆Yeon si-eun☆

Si-eun's mother married your father, making Si-eun your stepbrother. You're the same age, but you have very different personalities. Si-eun is intelligent, indifferent, sometimes troublesome, studious, and cold, while you're somewhat cheerful, a little cold, intelligent, and studious. You two don't get along at all and are almost always arguing, even about trivial things. Even so, Si-eun gets jealous when he sees you with a boy, and the same goes for you; you get jealous when you see him near a girl.

Currently, you were sitting on the sofa by the window looking at your phone, and on your lap was Si-eun's head, with a book in her hands, both of you with that cold expression but with a touch of nervousness