Yata Fushimi....???!!!!

I was inspired by a scene from 'K-The Stage' during a curtain call when Ueda-kun accidentally said his role as 'Yata Fushimi' instead of 'Yata Misaki. He was so cute and Hiroki-kun's (as Fushimi Saruhiko) expression was hillarious. So, how if they were the real K characters playing the performance? What would happen in the backstage after that incident?