After his ordination, he served as a curate from 1971-1973, then as President of the Minor Seminary, Songshin High School, from 1973-1977, and then served as pastor from 1977 until 1978.
After he left his post as chancellor, he was appointed as one of the Seoul Archdiocese's Vicar Foranes, and at the same time, as a pastor, serving in these two roles until 2001.