Igbo (Igbo: Asụsụ Igbo), or Igbo proper, is a native language of the Igbo people, an ethnic group primarily located in southeastern Nigeria. There are approximately 20 million speakers that are mostly in Nigeria and are primarily of Igbo descent. Igbo is a national language of Nigeria. It is written in the Latin script, which was introduced by British colonialists. Secret societies such as the Ekpe use the Nsibidi symbols which were invented by the Ejagham and were used to represent other languages like Efik.

There are over 20 Igbo dialects. There is apparently a degree of dialect leveling occurring. A standard literary language was developed in 1972 based on the Owerri (Isuama) and Umuahia (such as Ohuhu) dialects, though it omits the nasalization and aspiration of those varieties. There are related Igboid languages as well that are sometimes considered dialects of Igbo, the most divergent being Ekpeye. Some of these, such as Ika, have separate standard forms.

The Igbo people first used Nsibidi ideograms invented by the neighboring Ekoi people for written communication. These ideograms existed among the Igbo and other related groups before the 16th century, but died out publicly^{[dubious – discuss]} after it became popular amongst secret societies such as the Ekpe, who then made Nsibidi a secret form of communication.

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.