Rak-Su are the first X Factor victors to release a winner's song they'd written themselves. They have released their winner's song Dimelo.
This year's X Factor final was two weeks earlier as music producers eyed the lucrative Christmas chart as a launch pad for the newly launched musicians.
One of the highlights of this year have been the incredible original songs performed on the show taking the iTunes charts by storm.
He also praised runner-up Davies, saying: "Congratulations to Grace who is really an outstanding, outstanding artist".
Little Mix, Pink and Sam Smith all performed at the live final on Sunday night as Dermot O'Leary announced Rak-Su as the winners of the 14th X Factor series.
Meanwhile their mentor Simon Cowell first of all thanked Grace before saying that the boys were "gentlemen" and "stars" and gave a shout out to everyone who voted. This doesn't get paid for for nothing.
It was then onto the duets, where Kevin Davy White performed with Tokio Myers on Fastlove, Pt 1 by George Michael before Grace Davies duetted with BRIT Award victor Paloma Faith on Grace's track Roots.
Following his elimination, Kevin told Dermot: "Thank you the United Kingdom for believing in me to put me on that stage".
He's trying to raise £1million for children's hospice charities Together for Short Lives and Shooting Star Chase.
Mentored by Simon Cowell, the foursome - made up of schoolmates Ashley, Jamaal, Myles, and Mustafa - have been firm favourites for much of the competition, with their original material being well received by the show's fans when made available on download and streaming services.
"You wrote your own song, and not many people do that".