U.SSO Boy Member Profile U.SSO Boy was a kid group under ON1 Entertainment and 4D Label, the members included U.Win, U.Key, U.Lian, U.Neo, and U.L. They are the brother group of U.SSO Girl U.SSO Boy Fandom Name: – U.SSO Boy Official Colour:- U.SSO Boy Official Accounts: Instagram: U.ssoboys Facebook: U.ssocool U.Win Stage Name: U.Win Birth Name: Song Seung … Continue reading U.SSO Boy Member Profile