Achievements
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
Representing  South Korea
| |||||
| 1998 | World Junior Championships | Annecy, France | 9th | 10,000 m | 44:11.96 |
| Asian Games | Bangkok, Thailand | 5th | 20 km | 1:29:22 | |
| 1999 | Universiade | Palma de Mallorca, Spain | 6th | 20 km | 1:27:03 |
| 2000 | Olympic Games | Sydney, Australia | 30th | 20 km | 1:26:22 |
| 2001 | World Championships | Edmonton, Canada | 19th | 20 km | 1:27:47 |
| 2002 | Asian Championships | Colombo, Sri Lanka | 3rd | 20 km | 1:31:07 |
| 2004 | Olympic Games | Athens, Greece | 29th | 20 km | 1:28:02 |
| 2005 | World Championships | Helsinki, Finland | 16th | 20 km | 1:23:10 |
| East Asian Games | Macau | 2nd | 20 km | 1:24:44 | |
| 2006 | World Race Walking Cup | A Coruña, Spain | 63rd | 20 km | 1:29:13 |
| 2007 | Asian Championships | Amman, Jordan | 2nd | 20 km | 1:31:33.4 |
