In 1941, when the use of the Japanese language in Joseon was forced during the colonial rule era, Kim Pan-su gets a job running errands at the Korean Language Society despite being illiterate. After learning to read and write Korean by chance, Pan-su sees the dedication and passion of Jung-hwan and the other members in writing the 16,000+ Korean-language manuscripts. Gradually, Pan-su realizes that recording and preserving the Korean language is a crucial means to obtaining independence. Later, Pan-su helps Jung-hwan hold a public meeting with Korean language teachers to select words to be included in the ‘MAL-MO-E’ dictionary. Meanwhile, the Japanese’ investigation closes in on them!