Kim Seung Gyun (김승균), formerly known as U.Key (유키) , is a South Korean singer. He is a former member of the kids' group U.SSO Boy.
Career[]
2017–2018: U.SSO Boy[]
In 2017, he was announced as a member of Kids Planet's kids' group U.SSO Boy. They debuted on November 16, 2017, with their first digital single "Let's Go Now". U.SSO Boy disbanded on October 27, 2018.[1]