The Southern Han Peace Treaty stipulated that North Korea must sever all ties with the Ming Dynasty, and the Qing Dynasty inherited the suzerain-vassal relationship between the Ming Dynasty and North Korea. When the Qing army withdrew from North Korea, it not only robbed a lot of property, but also robbed many North Koreans, including members of the North Korean royal family, to return home. King Renzu of South Korea returned to the capital and found himself devastated. He looked at the enemy camp from a distance, and countless people were robbed, including women. . "It can be seen that many Koreans were taken to Manchuria by the Qing army in the Battle of C-Zi. According to China documents, 600,000 Koreans were kidnapped in Shenyang alone.
In the two wars against Korea, the Qing army captured 4986 Koreans in the battle of Ding Mao alone. Some of the Koreans who were taken captive to Liaodong were killed, some were redeemed, and some were incorporated into the Eight Banners. Most of them were slaves of Manchu aristocratic estates, and only a few escaped. There are two ways for the Qing army to redeem the captured Koreans: one is public redemption and the other is private redemption. The way to redeem important Koreans with Shenyang Qing government is called public redemption, and the way to redeem ordinary Korean soldiers and civilians is called private redemption. The Qing government sinfully regarded Koreans as a kind of trade goods, arbitrarily raised the price of captured Koreans and obtained a lot of property. It takes about 10 lean cow or hundreds of taels of silver to redeem a person. Koreans are already very poor, so many people simply don't have that much money and have to bear the pain of being separated from their loved ones forever.
Most Koreans failed to redeem them and were taken to manors in Tieling, Jianzhou and other places in Liaodong, serving as slaves of princes and nobles in the Qing Dynasty. Under the strict supervision of their masters, they go to work in the fields or obey their masters' arrangements, and live a dark and miserable life every day. In order to enhance their combat effectiveness, the Qing Dynasty forcibly incorporated some captured Koreans into its Eight Banners Army and forced them to participate in the war. Up to now, although there is little information about how many Koreans are in the Eight Banners Army, we find that there are many Korean surnames in the Eight Banners Army by reading historical materials, from which we can infer that there are not a few Koreans.