He is a vampire.

This a story of a vampire and y/n who is not human but she believes she's a human but only he knows she's not and he will come to take her back.

Y/n : who are you?(Scared)

Taehyung : (evil smirk) who do you think I am?

Y/n : yo-you can't be a human.(Trembling)

Taehyung : right I can't be a human cuz I AM A VAMPIRE.(Smirk).

If you are uncomfortable to read this kind of book , stories you can leave and if you want to know the rest then.............