The Korea Immigration & Integration Program (KIIP) by the Ministry of Justice offers social integration education in order to educate immigrants about Korean language and culture. This paper presents a case study on the development of Korean language textbooks for KIIP. Korean Language and Culture for Immigrants (Intermediate Levels 1 and 2) is used as a teaching material at 308 social integration education institutions. This paper introduced its development procedure and method, its development directions, the organization of its syllabus, and the content of its units. Its development process involved analyzing purposes of social integration education and of needs of incumbent teachers to develop a teaching material to meet the goals of social integration. Efforts were made to closely connect the content of Korean study to that of culture study with a focus on making culture study lead to an overall understanding of South Korean society and to serve fully as a preparation process to acquire Korean nationality. This paper will hold its value as a guideline to be consulted for the development of Korean language textbooks for immigrants and help teachers make efficient use of textbooks according to the objectives of education in a social integration program.