sentences:  In 1930, he published "Way of the seeker of truth" (구도자의 길;求道者之路) and on September15 he published "An Outline of Joseon Catholic History" (조선천주교공교회약사, 朝鮮天主敎公敎會略史).On March18, 1931, he resigned from the affairs of Pyongyang archdiocese (평양대교구;平壤大敎區) and moved to Seoul.Appointed as a teacher at Dongsung Commerce High School (동성상업고등학교;東星商業高等學校) on April1, 1931, he took on the responsibility of teaching English and rhetorical subjects.