The Catholic University of Korea, Seoul St. Mary’s Hospital imparted advanced medical system, including stem cell transplant surgery for leukemia in Mongolian children. In February 2014, the First Central Hospital of Mongolia performed first successful stem cell transplant surgery by the support from Seoul St. Mary’s Hospital. After the operation, the additional treatments regarding a kidney transplant and congenital heart disease were instructed. The First Central Hospital of Mongolia and Seoul St. Mary’s Hospital finally signed a MoU covering an expansive list of sectors, including treatment, research, education, and so on.