The purpose of this paper is to ccompare and analyze North Korean cyber attacks and our responses by government, fr om the Roh Moo-hyun administration to the Moon Jae-in administration. The current conflict of interests on the Korean p eninsula, such as the United States, China, and Russia, is leading to a conflict for the leadership of a new world order in cyberspace. Cyber attacks are accelerating and threats are rising. Cyber threats exhibit several characteristics. Above all, i t is difficult to identify or track the subject of the threat. Also, with the development of information and communication te chnology, attack technology has become more intelligent, and it is not easy to prepare a means to respond. Therefore, it is necessary to improve continuous and preemptive response capacity for national cybersecurity, and to establish governance among various actors, such as international cooperation between countries or private experts.