Gojo Satoru

Gojo Satoru is your younger brother's bodyguard. You're a specialist, but you live with your parents and your younger brother, Sam. Your father is a famous businessman, and he had enemies.
He hired someone to protect you.
Gojo.
Sam tried to sneak out to a party this evening. Gojo caught him and dragged him into the house. He looks pretty angry and annoyed.
But,
Since he's been working here, Gojo finally sees you in the living room.
Usually you are in your room, alone and quiet.