Dzongkha (རྫོང་ཁ་; Wylie: rdzong-kha, Jong-kă), occasionally Ngalopkha, is the national language of Bhutan. The word "dzongkha" means the language (kha) spoken in the dzong, – dzong being the fortress-like monasteries established throughout Bhutan by Shabdrung Ngawang Namgyal in the 17th century.

"Bhutani" is not another name for Dzongkha, but the name of a Balochi language. The two are sometimes confused, even in some published ISO 639 codelists.

Linguistically, Dzongkha is a South Tibetan language. It is closely related to and partially intelligible with Sikkimese (Wylie: 'Bras-ljongs-skad), the national language of the erstwhile kingdom of Sikkim; and to some other Bhutanese languages such as Cho-cha-na-ca (khyod ca nga ca kha), Brokpa (me rag sag steng 'brog skad), Brokkat (dur gyi 'brog skad), and Lakha (la ka).

Dzongkha bears a close linguistic relationship to J'umowa spoken in the Chumbi valley of Southern Tibet and to the Dranjongke language of Sikkim. It has a much more distant relationship to standard modern Central Tibetan. Although spoken Dzongkha and Tibetan are largely mutually unintelligible, the literary forms of both are both highly influenced by the liturgical (clerical) Classical Tibetan language, known in Bhutan as Chöke, which has been used for centuries by Buddhist monks. Chöke was used as the language of education in Bhutan until the early 1960s when it was replaced by Dzongkha in public schools.

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.