f(x) suspposed to open for world star Beyonce,turns to dissapointed?

Fans were very confused at not seeing them on stage before the diva came on.

SM Entertainment stated on the 21st that f(x)'s performance got canceled 2 hours before the concert. Because of f(x)'s absence, Beyonce had no opening act. SM Entertainment continued to say, "Around 6:00PM, we heard that they canceled the opening act. We wanted to get them on stage somehow but it couldn't happen and we are disappointed about it."

After f(x) was all dolled up and done practicing to get on stage for Beyonce