 She was a team-mate of both Bae Yeon-ju and Jung Kyung-eun at Masan's Sungji Girls' High School and in 2007, all three girls were runners-up at the 2007 BWF World Junior Championships.After graduating to the senior ranks, Yoo continued to play with both Jung and Shin Baek-cheol, her partner in her last year of junior play.She and Shin were mixed doubles runners-up at the 2010 Swiss Open Super Series.