서울시 마포구 합정동 371-26 덕양빌딩 Big Bang 앞우편번호 121-829
South Korea

english translation, but it’s preferred by the korean postal service to write in korean:
Seoul-si, Mapogu HabJungDong 371-26
DukYang Building: BIG BANG
ZIP: 121-829
SOUTH KOREA