A hand written letter? Im not sure about that. I know 당신 can 이메일 jon but lately they havent been able to interact with their 팬 (or so ive heard). If i come across anything i will post it here.
Probably...maybe write it to one and in bold on the 상단, 맨 위로 of the letter write:Read to the entire band please. Then somewhere in there ask if there's a way 당신 could write to them as a band
