The purpose of this study is to analyze the formation of Iri city and to identify how it has influenced the local society. The study had to be limited to the analysis of Japanese historical data because of the scarcity of Korean documentation during the colonial era. Subsequently, the data allows for understanding of the city’s history from the colonizer’s perspective and gives insights into the characteristics of the colonial power. The study focuses on Iri area because of its unique regional characteristics. A traffic hub for Japanese crop exploitation, and a cultural twilight zone where two cities meet; the administrative city Jeonju and the maritime city Gunsan. There are three books that fully cover the Iri’s regional history under the Japanese colonial era. After the first 10 years of Japan occupying Iri, a guidebook featuring the first generation Japanese immigrants' report named 『Guidebook of Iri』(『裡里案內』) by Yamashita Eiji,(1915) was published in an attempt to recruit second generation immigrants to settle them in the rice plantation so-called ‘Iri, the Gold mine of Honam’. Unlike the first edition's promotional feature to bring new settlers, 『Guidebook of Iri』(『裡里案內』), the second edition, Iri’s published in 1927, pointed out problems and limitations of Iri’s urban development. With cessation of immigration business in Oriental colonization company and failing to establish new noble schools, Iri’s Japanese population stopped its growth. To overcome the situation, local Japanese press urged the wealthy to amend the city’s problems; land lords lack of attention and water supply. But the wealthy did not like the accusation and responded by withdrawing advertisements and minimizing the sponsorship. Usually the regional informative publications were updated every ten years, but only a year later Iksan County office published an Iri’s regional information called 『Iksan Circumstances』(『益山郡事情』)(1928) using the same information as 『Guidebook of Iri』(1927) but only with minor new statistics. With a careful look, it was found that there had been disruptions in the Japanese immigrants society. After the mid-1930s, with the National Mobilization Law and the Joseon Division Training in Iri, the city began to delay its development. As a result, Iri’s the richest landlord, Ohashi Yoichi (大橋與市) sold his massive estate and Joseon’s waterway kingpin Fujii Kantaro (藤井寬太郞) was expelled to Japan. After the defeat in the Sino-Japanese war and the Pacific war, the Japanese left Korea empty handed via Iri station, the very station they built themselves to rule Korea.