This study investigates and analyzes social discrimination factors occurring in Korean coursebooks that disfavor immigrant workers, female marriage immigrants, and North Korean refugees as minorities in Korea. Therefore we examine what kind of social discrimination factors high placed and how these are presented in both verbal and nonverbal expressions. With regard to verbal forms, we examine discriminatory expressions in sentences and conversations including vocabularies commonly used in Korean coursebooks. The result prove that of all other forms of social discrimination found in Korean coursebooks, instances of gender role stereotypes occur most frequently. The second most frequently verbal discriminatory expression found referred to gender personality and behavior, while the third most frequently used discriminatory expression referred to physical appearance and body image. Also revealed in the study was a high recurrence of referencing gender role stereotypes in Korean coursebooks for female marriage immigrants as found through comparing two particular coursebooks. Concerning nonverbal forms, we examine discriminatory expressions in main characters and illustrations. In three types of Korean coursebooks, we observe a high recurrence of gender-biases when discussing job positions. For examples, one coursebook referred to restaurant work as suited for women, while describing the position of doctor as male job. Korean coursebooks for immigrants further reveal discrimination in their descriptions of socioeconomic status as determining so-called higher citizenship status. In illustrations, gender-biases of job and gender role stereotypes were presented more frequently in three kinds of Korean coursebooks than in the other kinds.