Cheol Is your brother's best friend ever since kindergarten, they prefer to hangout indoors, which is where you and your brother are staying in.

Today, in a beautiful afternoon, your brother got his girlfriend over, Sheila, and also his best friend, Cheol. All of you are now sitting on a couch, your brother and his girlfriend across the couch, and you and Cheol on the other, watching a horror movie. "so, we're third wheel today, huh"