The photo was taken by a club-goer, who spotted the K-pop idol at the bar. There were various photos of the idol at the bar. However, users pointed out that it's not really a big deal. In Thailand, the gay bar cabaret performances are quite famous and they're even a part of the visit activities for popular package tours.
Many netizens believe that member 'A' is 2AM's Jo Kwon.
Source: Star Daily News