〈Soakisokyeong〉 composed of 2019 letters, 306 paragraphs is written by Cheongsa, Sim Sanggyo. The book is modeled on 〈Esokyeong〉 of Gulwon. It is roughly divided into two parts: the main body and closing, but in detail into six sections. In the first section, he extols his father’s virtue and shows the high pride of himself. In the second section, he pleads discord with the world and his family’s misfortune. In the third section, he plainly laments over his own misfortune. In the fourth section, he takes on a trip toward a fantasy world owing to his unbearable indignation. In the fifth section - the last part of the main body, he discloses his self-abuse and deploring as a writer. In the final section, he exposes his mind toward reality. He clearly describes the pride of a lyrical ego, anger, and bitterness. His purehearted ego always endeavors not to run his father’s achievement down with his ambition spreading out. However, his intention like this fails because of the discord among those around him. The image in 〈Soakisokyeong〉 that he wants to spread out his own aspiration toward the world, but fails, finally being frustrated and discouraged might be, in fact, his self-portrait. That’s because he comes to realize that the high aim he had in mind when young cannot possibly be accomplished when he grows up. To make matters worse, a terrible misfortune occurs in his family. At first, he laments and deplores it deeply, but accepts his fate with contemplative attitudes as time goes by. There appears two times ‘sightseeing’ of the lyrical ego in the book. The ego with an unbearable anger and bitterness wants to whine to the King of Kings but fails. So, he heads another place, that is to say the beginning in history. He also searches for a legendary king. His imaginary journey, however, cannot achieve the goal. If Simsanggyo is substituted for the lyrical ego, he seems not to find any other way to relieve his anger and deep resentment in reality. Compared to 〈Esokyeong〉 of Gulwon, the contextual structure of 〈Soakisokyeong〉 is very similar to 〈Esokyeong〉 in that their own family and father are described in the beginning of the two works. In addition, that their poetic egos are kicked out and then set out on a trip far away in frustration is the same, too. The general idea, its metaphor, and the manner of a story development are analogous to each other. Finally, some similarities are found in the usage of several phrases and exclamations. The first conspicuous different feature is in the attitude of the two egos expressed in each closing section. While the protagonist of 〈Esokyeong〉 wants to follow Paengham to the grave, the one in 〈Soakisokyeong〉 decides to obey the will of Heaven. The second one is that references to his father are little in the one, but, in the other, the words of praise for his father are quite detail. Another one is the description about the negative aspect of a king is concrete in 〈Esokyeong〉 but not in 〈Soakisokyeong〉 Accordingly, those differences seem to be attributed to Sim Sanggyo’s attitude as a confucian scholar, his family’s misfortune, and his personal history not having been involved in any political affairs.