[b] After his defection, Kim served in the Joseon army, contributing to Korean victories over Japanese forces in the battles of Dongnae and Ulsan.

Kim continued his military service after the end of the Japanese invasions in 1598, working for 10 years on securing the northern border.

In 1636, he participated in the defense against the Second Manchu invasion of Korea, credited with the death of some 500 Qing troops at the battle of Ssangnyeong.

After Joseon's surrender to the Manchus, Kim retired from military life, moving to Daegu where he married the daughter of the mok administrative district commander Jang Chun-jeom (장춘점; 張春點).

Kim devoted himself to Confucian ethics, promulgating gahun (family principles) and hyangyak (village creed).