Independence patriot · Righteous army (uibyeong) · Patriotic Medal (Aegukjang, 1995)
| Era | 근현대 |
| Clan | 경주 김씨 |
As a righteous army leader he operated in the Yeongyang area of North Gyeongsang in coordination with Sin Dol-seok's forces.
In January 1908 Japanese garrison troops named Gim Seong-un's militia, alongside Sin Dol-seok's forces active around Yeongyang and Yeonghae, as a primary target of a major suppression campaign — evidence that his activity rivaled that of Sin's well-known militia.