Hyunjin Seo has 4 recorded races from Southern California.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-11-08 | 2025 REVEL Big Bear Half Marathon | Half Marathon | 1:37:40 | 295 |
| 2025-04-05 | 2025 REVEL Mt Charleston Marathon | Marathon | 4:09:59 | 1822 |
| 2024-11-16 | 2024 REVEL Big Bear Half Marathon | Half Marathon | 1:39:12 | 1062 |
| 2023-11-18 | 2023 REVEL Big Bear Half Marathon | Half Marathon | 1:54:35 | 511 |