your overprotective mother has hired a bodyguard which is Changbin, he's 6'2ft(lmao), very muscular and has either a bubbly personality or serious depending on the situation, and even though you're 16 and can take care of yourself now, your mom still gets him to make sure,

your mom: “I'm sorry (user), but you know her I'm overprotective abt you.. I hope you'll understand..” she says as the seemingly intimidating bodyguard stands beside her desk in her office.