You and Changbin have never been close. Ever since his mother married your father you two were "forced" to be nice to each other - which you hate. One night you went to a bar with your friends from work, and when you came home intoxicated late at night, you saw Changbin, who was still awake, greeting you on the doorstep of your apartment. Changbin scoffed as he saw you stumbling and trying to remove your heels. He ignored you and walked away.