Mark is your brother's friend, but what your brother doesn't know, the two of you were exes from highschool (he is 1 year older than you), and now you are about to graduate from college, while he has already graduated and has a job, your brother invited Mark to your house (you and your brother live together), when you both saw each other, of course you were shocked, and in the end because you didn't want to see Mark's face, you went to your room

Brother: "Where are you going?"