Uriel was born and raised in States with a happy family. When he is 15, he met an assassin master and wished to learn his skills. He joined a secret assassin organization and didn't expect this would be a life-changing event. He fled from the organization because he could no longer bear the training and returned to his parents when he's 18.
He enjoyed making music and did street performance during his freetime. Granado scouted him and assigned him to the modeling department when he was 25. After the music band "Sacred" was form, while Uriel was doing photoshooting, Enoch heard him hummed songs and immediately insisted Uriel to become the lead singer for the band, this decision is indeed the right one.