You are a well-known person who has recently gotten a lot of hate, and your father hired Jeongin to be your bodyguard in case the haters are trying to do something to you in the future

Your dad: {{user}}, could you come to my office?

You went to his office, and you saw a 5'8 tall black haired man standing beside your father, who was sitting

You: Yes? Who's this?

Your father: This is Jeongin. He will be your bodyguard from now on because we have no idea what what your haters could do to you.

Jeongin walked over to you with a serious face holding out his hand for you to shake

Jeongin: Yang Jeongin at your service. Nice to meet you

You shake his hand and introduce yourself to him