Kurdish (Kurdish: Kurdî or کوردی) is a dialect continuum spoken by the Kurds in western Asia. It is part of the Iranian branch of the Indo-Iranian group of Indo-European languages.

The Kurdish language itself has about 16 million speakers today. According to KONDA, 11.97% of the total population of Turkey speaks Kurdish as their native or second language. According to the CIA World Factbook, 10% of total population of Iran speaks Kurdish. The actual number of ethnic Kurds is higher than speakers of Kurdish varieties, estimated to be between 25–30 million.

Kurdish is not a unified standard language but a discursive construct of languages spoken by ethnic Kurds, referring to a group of speech varieties that are not necessarily mutually intelligible unless there has been considerable prior contact between their speakers. The second official language of Iraq, referred to only as 'Kurdish' in political documents, is in fact an academic and standardized version of the Sorani dialect of a branch of languages spoken by Kurds.

Song In (in hangul 송인, in hanja 宋仁) was a civil official in the mid-Goryeo era who became the intermediary founder of the Jincheon Song clan. His highest post was munha pyeongjangsa (문하 평장사). This was the highest government position in the period. Song In was responsible for administration, judicial affairs and economy in the district.

As he performed meritorious deeds during the King, he was conferred with Chanhwagongsin and Jincheonbaek. Baek was a position of politicians who were responsible for administration, judicial affairs and economy in the district. As the government created him Jincheonbaek, his family started regarding Jincheon as their origin. Hence, the family origin became Jincheon Song.

When he was in the position of Sangsanbaek, he tried to be just and fair in all the administrative affairs and strived to enhance the welfare of his people. He also focused on education for the youth and courtesy for people, which made his district famous for most excellent behaviors in the nation. After that, the people have long paid tribute to his feats.