The standard way to say "Happy Birthday" in Korean is "saengil chukhahaeyo" (생일 축하해요) which you would use when talking to someone older or someone you're not super close with.
Bangtan Boys ❤ Yoongi (suga) | tumblr
Bangtan Boys ❤ Namjoon (rapmon) | tumblr//// the glasses!! With the glasses!!! You're killing me rap mon....
HAPPY J-HOPE DAY <3 #HappyHopeDay #홉이생일ᄎᄏ #HappyJHOPEday
Bangtan Boys ❤ Taehyung (v) | wink wink! | tumblr
Happy birthday to the cooliest dude ever, RAPMONSTER!!! #RapmonDay
BTS - Photo teaser pour War Of Hormone
|BTS| #Bangtan - Suga (Min Yoongi)
HAPPY BIRTHDAY JIN !!! ♥