| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Jeong•Seong-Il | |
| Used name | Jeong•Seong-Il | |
| Name order | Oriental | |
| Original name | 정•성일 | |
| Other names | Jung Sung-Il | |
| Born | 21 October 1969 in Seoul, Seoul |  KOR |
| Measurements | 173 cm / 67 kg | |
| NOC | Republic of Korea | KOR |
Jung Sung-Il had the following placements at major international championships - Men: 1988 World Championships (DNQ for final); 1989 World Championships (DNQ for final); 1990 World Championships (15th); 1991 World Championships (14th); 1993 World Championships (20th); 1994 World Championships (20th).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1988 Winter Olympics | Figure Skating (Skating) | KOR |
Jeong Seong-Il | |||
| Singles, Men (Olympic) | 22 | |||||
| 1992 Winter Olympics | Figure Skating (Skating) | KOR |
Jeong Seong-Il | |||
| Singles, Men (Olympic) | 21 | |||||
| 1994 Winter Olympics | Figure Skating (Skating) | KOR |
Jeong Seong-Il | |||
| Singles, Men (Olympic) | 17 |
