Responses
9X and 9Y are two different years in the 1990s. yesung was born march 29th 199Y and gyeol July 31st 199X.
yesung put on his gym from that he was born july 10th 199X. 199X is the year gyeol was born which makes him 27.
its possible yesung could be 26 and not 27 or maybe older considering Y comes after X in the alphabet.
Wait so is he younger or older?