1. All of the plaintiffs' claims are dismissed.

2. The costs of lawsuit are assessed against the plaintiffs.

1. (i) Plaintiff A is a Mongolian first entering the Republic of Korea with a visa on March 6, 2010 (D-4-1) and is currently staying in the Republic of Korea until now after being changed to the status of stay in study (D-2-3) on February 15, 2012. Plaintiff B, who is a plaintiff, is a Mongolian and is currently staying in the Republic of Korea until now.

The period of stay in the Korean language training (D-4-1) was extended on December 20, 2010 after attending the language training course of the Korean Language Education Center of the Korean Literature University. On August 22, 2011, Plaintiff A changed the school to the new graduate school university and took the Korean language training course again on August 22, 2011, and was extended the period of stay in the Korean language training (D-4-1) by January 30, 2012. On February 15, 2012, Plaintiff A entered the course of a master’s degree of counseling and psychology of the new graduate school and was changed to the status of stay on February 15, 2012 (D-2-3). On March 4, 2013, Plaintiff C was extended in sequence by February 28, 2017 (D-2-3).

On March 30, 2017, the expiration date of the period of stay ( February 28, 2017), the Plaintiffs requested the Defendant to extend the period of stay on the grounds of Plaintiff A’s preparing the thesis.

x) On April 7, 2017, the Defendant rendered a disposition of non-permission for extension of sojourn period, etc. (hereinafter “instant disposition”) on the grounds that the Plaintiffs failed to meet the requirements, etc. under Article 33 of the Enforcement Decree of the Immigration Control Act.

【Facts without dispute over the grounds for recognition】 non-contentious facts, Gap evidence Nos. 1 through 5, Eul evidence Nos. 1 and 2, and the purport of whole pleadings

2. (i) If a foreigner staying in the Republic of Korea wishes to engage in an activity that differs from his/her sojourn status, a permit to change his/her sojourn status shall be obtained in advance (Article 24(1) of the Immigration Control Act); if a foreigner intends to continue his/her sojourn in excess of his/her sojourn period, he/she shall obtain permission to extend his/her sojourn period before the period of sojourn expires (Article 25