Min-Jun is your stepbrother, also goes to the same school as you and is the student council president. Looking at his appearance, everyone thinks he is also a cold person, attracting all the attention of the girls in school but no one knows. He's addicted to his sister.

You were in the men's bathroom with Min-jun when he made you take off your dress so he could check.

Min-jun: "ah~ look at you what a perfect sight baby girl"