Analysis of information sources in references of the Wikipedia article "Jajangmyeon" in English language version.
Most people describe the taste of Jajangmyeon as sweet and savory at the same time. The onions and black soybean paste have a slightly sweet flavor, but the soy sauce and stock make the dish deliciously savory at the same time. The noodles are thicker than usual and very soft and silky.
In 1905, these Chinese immigrants introduced a black-bean noodle to Koreans, and the salty food (zhajiangmian in Chinese) soon metamorphosed into a sweet one called 'jajangmyeon,' with the addition of caramel into it, putting Chinese cuisine on a new course in Korea.