| Roles | Competed in Olympic Games | 
|---|---|
| Sex | Male | 
| Full name | Yu•Yong-Seong | 
| Used name | Yu•Yong-Seong | 
| Name order | Oriental | 
| Original name | 유•용성 | 
| Other names | Yoo Yong-Sung | 
| Born | 25 October 1974 in Dangjin, Chungcheongnam (KOR) | 
| Measurements | 173 cm / 69 kg | 
| Affiliations | Hannam University (KOR) / Samsung Electro-Mechanics Co. (KOR) | 
| NOC |   Republic of Korea | 
| Medals | OG | 
| Gold | 0 | 
| Silver | 2 | 
| Bronze | 0 | 
| Total | 2 | 
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1996 Summer Olympics | Badminton |  KOR | 
Yu Yong-Seong | |||
| Doubles, Men (Olympic) | Kim Dong-Mun | =17 | ||||
| 2000 Summer Olympics | Badminton |  KOR | 
Yu Yong-Seong | |||
| Doubles, Men (Olympic) | Lee Dong-Su | 2 | Silver | |||
| 2004 Summer Olympics | Badminton |  KOR | 
Yu Yong-Seong | |||
| Doubles, Men (Olympic) | Lee Dong-Su | 2 | Silver |