Super Junior's Kyuhyun will be singing the congratulatory song at former U-KISS member Dongho's wedding. 

Kyuhyun's agency SM Entertainment confirmed on November 4, "Kyuhyun plans to sing the congratulatory song after being asked by Dongho." The news comes as a bit of a surprise as not many knew that the two idol stars were friends or more than acquaintances.

In related news, Dongho publicly released a letter to inform his fans and others that he had never planned to reveal the details of his marriage or wedding

Did you know what Kyuhyun and Dongho were friends?