In the year that Dojeon turned 21,
he shifted his focus towards education and began teaching at Jindae Private School
located in Gwangjin Village, Jangyeon Township, Goesan County, North Chungcheong Province.
He dedicated two years (1937-1938) to teaching students there
before relocating to Sinheung Village School in Yuha Village, Goesan County,
where he continued his teaching career from 1939 to 1940.
During that time, the Japanese imperialists,
who initiated the Second Sino-Japanese War in 1937,
enforced the ‘National Mobilization Order’ in Joseon under Japanese colonial rule
and implemented the Third Joseon Educational Ordinance in 1938,
which forbade Korean language education.
Consequently, when the private school, Shinheung Village School,
was forced to close in 1941,
Dojeon decided to depart for Fengtian Province in Manchuria.