Write your letter clearly and politely
Address it to BTS or to the specific member you want to reach
Use the official mailing address provided by BTS or their agency, HYBE
Check the latest official fan mail instructions on HYBE’s website or BTS’s official channels
Place the letter in an envelope with the correct postage
Include your return address if you want a reply
Send it through your local postal service
Do not include gifts, food, or prohibited items unless official instructions allow them
Follow any country-specific mailing rules and the agency’s current guidelines