For other people known as 'Seongwon' or 'Sungwon', see Seungwon and Sungwon.
Seongwon (승원) is a South Korean singer and lyricist under Victory Company. He is a member of the boy group NTX and a former member of the kids group U.SSO Boy under the stage name U.Win (유윈).
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]