Their Bon-gwan is in Yonan County, Hwanghae Province.
According to the research held in 2000, the number of In clan of Yonan’s members was 588.
Their founder was In Hu [ko] who was a Mongolian and worked as civil servant.
In Hu [ko] entered Goryeo as a bodyguard of Princess Jeguk, the daughter of Kublai Khan.
The daughter had a marriage to an ordinary person planned by Chungnyeol of Goryeo.