Because of the KAPF which was founded in mid-1920 and 『Beolnara』 as an official journal of KAPF, there was a big change on the of children`s literature in late 1920. In late 1920, 『Earini』`s leading was finished and 『Earini』 and 『Beolnara』 coexisted. 『Beolnara』 concentrated its effort to educate the socialism to the proletarian children. Although 『Beolnara』 didn`t show the class consciousness at the starting point, it was changed to journal which has purpose by the influence of KAPF`s ``first change of direction`` and ``popularization theory of art``. As two key persons of 『Beolnara』, Song young and Im wha made a contribution on the children`s play by leading . They also introduced new areas such as and . was designed to educate class consciousness at the time that socialism has influence. It was utilized to lead the children to read and write the novel in easy way. By the , Im wha provided children better environment of art and culture. The outstanding activities that Song young and Im wha showed through 『Beolnara』 can be known by the discussion with companion or by the more delicate text analysis.