Gonghwachun (Korean: 공화춘; Hanja: 共和春) was a historic restaurant specializing in Korean Chinese cuisine in Incheon Chinatown, South Korea. It first opened some time between 1905 and 1908, and is considered the first restaurant to serve the dish jajangmyeon in Korea. It closed in 1983. Its original building was made a Registered Cultural Heritage of South Korea in 2006. In 2012, a Jajangmyeon Museum was established in the building.

There is a modern South Korean restaurant franchise under the same name that was created in 2004 that claims descendency from the original. Its authenticity is disputed by descendents of the founders of the original restaurant. Some descendants of the founders operate a nearby restaurant called Sinseung Banjeom.

Chinese settlers arrived in Incheon following Chinese soldiers sent to quell the 1882 Imo Incident.

The restaurant's precise founding date is uncertain. It was founded in either 1905, 1907, or 1908 by Yu Xiguang (Chinese: 于希光; Korean: 우희광; MR: U Hŭigwang; 1886–1949), a Chinese person who came to Incheon from Shandong, China. The restaurant was originally founded under the name Shāndōng Huìguǎn (Chinese: 山東會館; Korean: 산동회관; MR: Sandonghoegwan). It served as both a restaurant and inn for primarily Chinese customers. In either 1912 or 1913, in honor of the establishment of the Republic of China, the restaurant changed its name to Gonghwachun (lit. 'spring of the republic'). During the 1910–1945 Japanese colonial period in Korea, the restaurant became seen as a premiere destination for Chinese food in Korea.

The Chinese dish zhajiangmian, which was popular in Shandong, was served in the restaurant. The zhajiangmian served in the restaurant was originally a brown color. At some point, caramel was added to the tianmian sauce (chunjang in Korean), which made it a black color.

According to the recollection of a great-grandson of Yu, the restaurant had a waiting area on the first floor. On the second was a dining/event hall, kitchen, and accommodations for workers. It had around 10 staff members. There were square and round tables. By the 1960s to 1970s, the restaurant regularly held weddings and other events. It was reportedly also popular with Taiwanese marines that docked at Incheon. First Lady of South Korea Yuk Young-soo, wife of Park Chung Hee, was reportedly a fan of the restaurant. Yu died in 1949, and his eldest son Yu Hongzhang (Chinese: 于鴻章; Korean: 우홍장; 1917–1993) took over the restaurant. Hongzhang purchased a building adjacent to the restaurant and merged the buildings to increase the restaurant's size. He reportedly became seen as a leader among the Chinese community in Incheon by the 1970s.

By the 1980s, Gonghwachun entered a decline. This was due to a number of reasons: Koreans began establishing their own Chinese restaurants in greater numbers and the South Korean government had restrictions on foreigners conducting business in Korea. In 1983, Gonghwachun was closed, and Yu Hongzhang and most of his family moved to Taiwan. Yu's eldest son, Yu Xinchen (Chinese: 于心辰; Korean: 우심진; 1940–2003) was reportedly the only member of the family to stay in Korea. He ran the restaurant Junghwalu (Chinese: 中華楼; pinyin: Zhōnghuálóu; Korean: 중화루).

On April 14, 2006, the building was made Registered Cultural Heritage of South Korea No. 246. That year, work began to convert the building into a museum. On April 28, 2012, the Jajangmyeon Museum was opened in the former building of the restaurant.