Their official Instagram: https://www.instagram.com/vanner__official/
Their Official Twitter: https://twitter.com/VannerOfficial
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Note: Only the hangul spellings of their names have been verified, and I know a bit of hangul to figure out the name, but sometimes there can be minor mistakes. (ex. 영 can be Young, or Yeong; 광 can be Kwang, or Gwang)
Name: Youngkwang (?)
Hangul: 영광