My Older Brothers are BTS and Seventeen

You're jogging outside when you suddenly disappear, you find yourself in Korea when you awake, you were forced to learn korean as well as mandarin, Japanese and you already spoke English. You were forced to sing to get money and you were treated badly, after the traumatic experience, you never want to speak again. You were an outgoing, cheerful person, that's why you were jogging, but after everything that happened, you were really skinny. While being forced to walk for days without food, water or rest someone saves you... Who is it?

Author: In this book no one in BTS or Seventeen has a sibling.

Seventeen are in this book too, BTS first though.