Built in 1923, this red-brick building was originally the Joseon Bank Gunsan Branch, a major financial institution operated by the Japanese colonial government. Though two stories in structure, it rises to the height of four stories and features a grand, steeply pitched roof. The front entrance projects outward with five flat arches, flanked by semi-circular arches on either side. As a symbolic landmark of Gunsan’s modern history, it appears in the novel "Tangnyu" ("Murky Waters") by Chae Man-sik, set in colonial-era Gunsan. Today, the building operates as a modern architecture museum, exhibiting works related to Gunsan’s modern architectural heritage along with currency and historical artifacts from the Japanese colonial period.