His Truth (BTS FF)

Kim Taehyung learns that he has a secret that he must keep from the world but one person finds out what that secret is.

"Let go of me, what do you want from me?" Said Taehyung
"I want to be back in your life." Said a dark figure.
"Back in my life? What do you mean I don't know you!" Said Taehyung
"But you do."

Does Taehyung know this person or are they playing tricks on him find out and see!?!?!?!?