Giannis Karagiannis ( ) ( born 25 July 1994 ) , sometimes credited as John Karayiannis , is a Greek Cypriot singer and songwriter who represented Cyprus in the Eurovision Song Contest 2015 with the song " One Thing I Should Have Done " . Previously he tried to represent Cyprus in their national final for the Junior Eurovision Song Contest in 2007 and 2008
One Thing I Should Have Done
One Thing I Should Have Done
Giannis Karagiannis