This paper considered a colloquial imagination in Seo, Jeong-Joo`s first book of poems, ?Hwasajip? from the following four perspectives. Firstly, it ``accepts an oral language through a body language``. It proves that an oral language is ``a straightforward(Jikjeong) language emphasizing and reflecting physical phenomena``, beyond the concept of a simple and individual dialect. Seo, Jeong-Joo``s poetic language has spontaneous properties and intactly shows properties of spoken language. This is worthy of notice as a poetic language unique to Seo, Jeong-Joo. Secondly, it ``repeats and expands a colloquial language``. Repeated effects of sound and a conscious repetition of a poetic language are recognized as media to exteriorize poet``s inner state. It was found that this process was helpful for the poetic narrator to express his poetic consciousness more solidly. Thirdly, it ``discovers ecriture and a poetic will``. Seo, Jeong-Joo releazed ecriture`s aesthetic beauty using non-sensuous similiarity and his own unique sense of language. Particularly, he frankly conveyed his mental state to readers, by using punctuation marks intensively. Lastly, it ``expresses the feelings of despair based on poetic self-consciousness``. As a result, a colloquial language used in Seo, Jeong-Joo`s poems is associated with the feelings of despair. It represents that the poet`s personal experience promoted using the colloquial language. It was also found that the poetic selfconsciousness inside him was embodied in a literary way.