The purpose of this study is to investigate about security service history as enlightenment period from the provisional government to 1920s. This study used materials by historical facts for the regulations and books in provisional government, newspapers in 1920s. There are four parts conclusion of this study: police department of provisional government, security service agency in the provisional government, security service agents of an independence movement, the general society of Korea.
Firstly, Kim Gu, a prominent Korean nationalist leader, was understand of security service which was to protect provisional government from the enemy. So, Kim Gu participated in training of security service agents in the police department of provisional government.
Secondly, there was security service agency in the provisional government. In 1920s, security service agency and agents appeared for the first time in regulations of the provisional government. At the beginning of the security service agency\'s appearance was influenced on background and circumstances for Korean independence activist who helped the independence of Korea from Japan.
Thirdly, security service agents leaded an active for independence movement of the private organizations in 1920s. They carried on an independence movement in defiance of Japanese coercion as nationalist in Korea history.
Fourthly, security service came out the general society of Korea in 1920s. The security service was not just for safety, but also for its security system and peace of mind, which were influenced by the political situation, social environment in 1920s. For the this reason, now security service has safety perception in Korea despite the historical progress.