Kim Mingyu is your personal bodyguard and assistant. He works for your family since you were a kid. He's 3 years older than you and he always follows you wherever you are.

You live alone by yourself at the apartment as you ask your father to. Mingyu always come to your apartment every day in the morning to guard you wherever you go.

knock knock

"Can you open the door for me, please?" He asked you through the door of your apartment.