Jajangmyeon Period COrigin theory CVerified

Jajangmyeon is a familiar sight in Korean-Chinese diners: thick wheat noodles tossed in a glossy, dark-brown sauce. The heart of that sauce is chunjang, a black, sweet fermented-bean paste, stir-fried with pork, onion, and potato. Wheat and soybean paste had long been part of the Korean table, so the noodles and the paste themselves were already close at hand.

The dish's story is set in the Chinatown of the port city of Incheon. Laborers who had crossed from Shandong province brought their hometown zhajiangmian with them, noodles dressed in a Shandong bean sauce. That sauce had the plain brown of fermented bean paste, not the deep black it would later become. No record has yet been found that says when the noodles first arrived. According to the food columnist Park Jeong-bae, the dish's name already appears in the magazine Gaebyeok in 1934, in a diary written that same year by Mun Il-pyeong, and in the newspaper Dong-a Ilbo in 1936.

The dark, sweet chunjang came together only afterward. In 1948 the Chinese immigrant Wang Songshan founded the Yeonghwa soy-sauce works in the Yongsan district of Seoul and began making Korea's first noodle paste, sold under the Saja-pyo (Lion Brand) chunjang label. Around the mid-1950s, mixing caramel into it produced the glossy, sweet-black sauce. Darker and sweeter than its Chinese counterpart, this sauce is what sets Jajangmyeon apart from the parent zhajiangmian. Once served in the overseas-Chinese eateries of Incheon's Chinatown, the dish is now eaten all over Korea and known to everyone there.

A well-worn story holds that Gonghwachun, a Chinese restaurant founded in Incheon's Chinatown in 1905, was where Jajangmyeon began. A named, venerable restaurant with a founding year attached made an easy and satisfying birthplace story. The dates in the sources, however, do not match it. A Seoul Metropolitan Government page says the founder moved from Shandong to Incheon in 1907 and that the Shandong Hall was renamed Gonghwachun in 1913. A 2026 article in the Kyeongin Ilbo newspaper also puts the move in 1907 but dates the renaming to 1912, so even these two accounts disagree. Neither fits a founding in 1905.

The Seoul page describes Jajangmyeon as originally noodles mixed with a Shandong bean sauce, a quick meal for the Chinese laborers working the docks of Incheon's port. The Kyeongin Ilbo article says Gonghwachun is known as the first place in Incheon to sell a dish under the name "jjajangmyeon." Gonghwachun has been called the original, but no record has yet been found showing that the dish was invented there, or that any one shop created it in any particular year.

None of this denies the dish's arrival from China. The larger arc, in which Shandong immigrants carried zhajiangmian to Incheon and it was reworked in Korea into noodles with a sweet black chunjang, is regarded as the established account of the dish's history. What lacks solid grounding is the story that ties that long process to a single restaurant and a single year.