This study set out to focus on the manifestation of Americanrepresentations in the serious slips of the pen's poems and investigatetheir differences from those in the previous periods and their meanings. The study examined American representations in the serious slips of thepen works during the liberation period with For Whom Is Our YouthFull?, which is a poem by Yu Jin-oh that got the serious slips of thepen in 1946, and Paeans, a collection of poems by Im Hwa, whose bookswere banned after he got the serious slips of the pen in 1947. In For Whom Is Our Youth Full?, a poem by Yu Jin-oh, the Americanrepresentation is "the new conqueror" that was Japanese imperialismwith only the appearance altered. In the poem, the poet ferociouslycriticized the U. S. A. as the successor of the colonial remnants. Thespeaker urged the listeners to have an awakening and critically viewAmerica in an instigating tone of voice using an ironic question manytimes. Paeans, a collection of poems by Im Hwa published in 1947, was a sortof political response to the Eunghyang Event that took place in NorthKorea in the same year. However, a sudden order banned the book fromthe shelves in the store. Particularly problematic was Let's Take Downthe Flag, in which the poet read American representations as the symbol of capitalism whose metonyms were "the foreign supervisor" and"canned goods." Korea's non-autonomous liberation subjected it to theAmerican military administration, and he as a herald anticipated thatAmerican capitalism would exploit poor Korean people economically andhave them under its control. Getting the serious slips of the pen during the liberation period, Yuand Im exhibited very critical and pioneering perceptions of the U. S. A. for the time through their American representations in their works. Inthe 1950s when the Cold War system was rapidly reinforced during theKorean War, it became difficult to come across negative Americanrepresentations or critical perceptions of the U. S. A. in South Koreanliterature. The study results show that the serious slips of the pen dueto political ideology after liberation were very closely related to thecritical perceptions of the U. S. A.