The Haeju Seok Clan and the Seongju Seok Clan

The progenitor is Seok Seong.
During the outbreak of the Imjin War, he served as the Minister of War for the Ming Dynasty.
He planned and executed the dispatch of troops to Joseon.
During the war, negotiations were underway, but when the fraudulent negotiation documents between Shim Yu-gyeong and Konishi Yukinaga were discovered, Seok Seong was falsely accused and imprisoned.
Seok Seong instructed his children to naturalize in Joseon.
His younger son naturalized in Joseon and became the progenitor of the Seongju Seok clan.
His eldest son did not listen to his father and remained until the end, suffering through his father's imprisonment.
After his father died in prison, the son headed to Joseon with his mother.
The place they arrived at was Haeju in Hwanghae Province, where they naturalized and became the Haeju Seok clan.
While the total Seok population exceeds 50,000, the Haeju Seok clan has fewer than 3,000 members,
and the Seongju Seok clan is similar.
They are the direct descendants of Seok Seong, the Ming Minister of War who actively helped defend against the Imjin War.
Joseon, especially under Gwanghaegun, embraced all foreigners.
Even surrendered Japanese people were all accepted as subjects of Joseon.
Joseon was a multi-ethnic nation that accepted naturalization from Mongols, Jurchens, China, Japan, and even Westerners who drifted ashore.