The Sino-Japanese War and the Russo-Japanese War affected a lot in the field of modern literature in South Korea and Japan. While Japanese literature was characterized as postwar literature, South Korea was far behind modernization and was influenced by social and political ideas such as the spirit of independence and thoughts of civilization and enlightenment. In 1898, Japan noticed the advent of a genre of novel-the first novel (Kuleno nijoohathinithi by Roan) in which emphasizes social difficulties to herald social absurdity appeared in Japan shortly after the end of the Sino-Japanese War. After the Russo-Japanese War, the development of a socialist movement along with resistance toward the ruling powers evolved into Marxism, finally creating a new genre called social novels. In a ten year span known as the enlightenment period, Japanese novels shifted from political novel to social novels. Over the following ten years they further evolved into socialist novels. Each genre appeared as a reflection of social conflicts, such as the ideas of civil liberties and resistance against the ruling powers. In South Korea, political novels having an enlightening character and new novels nearly completing the unity of speech and writing came out nearly at the same time. Suffering from the Sino-Japanese War was reflected by a new novel named 'Hyol u nu(1906)' by Injeek Lee. Due to this fact, social novels in South Korea's modern literature only could be sort of a unfamiliar genre. In other words, when compared to Japan, features found in 'Ukigumo' by Futabatei shimei, which has distinguishing marks of political novels and was written by a unity of speech and writing and considered as a leading novel in modern literature, and other social novels of Uthida roan and Tokutomi roka could be seen in the novel of 'Hyol u nu' contemporarily. So the reason that people defined 'Hyol u nu' as a mock or a quasi-political novel is that they didn't analyze literary conditions. This is clear when compared to Japanese modern literature and the times and societies at the end of the Joseon Dynasty in detail. This study looked closely at the progress of the novels' birth and changes by centering on pre-studying of a flow of South Korea's new novels and Japan's social novels. Specific contents and features of how each genre has been changed can be found out through analyzing novels. The study of 'Hyol u nu' by Injeek Lee can be conducted though comparing and analyzing the novel named 'Kuroshio' by Tokutomi Roka featuring similar subject matters and themes at the same age and finally find out features and contents of new novels and social novels.