Naengguk refers to all kinds of cold guk (soups) in Korean cuisine, mainly eaten in summer. It is so called changuk, which literally means "cold soup" in pure Korean, while the term naengguk is a combination of a hanja word and a pure Korean word with the same meaning.The first historical record on naengguk appears in a poem written by Yi Gyu-bo (1168–1241), a high officer of the Goryeo period (918–1392).