The government enacted shutdown system in the fall of 2011. It was to secure a right to sleep for the youth and prevent them from being addicted to game. The opinion on the system was dichotomized: gamers were against it for the reason that shutdown system was not effective while non-gamers like parents thought that it was a measure to prevent game addiction. The trust of the public on the government is influenced by the factors of moral and competence. That is, if the policy chosen by the government is effective, the public come to trust their government more. Focusing on the factors of the government competence, this study examined to know how the effectiveness and efficiency of governmental policies have impact on the public trust on the government. Particularly this study looked carefully into what factors of political effectiveness have impact on the trust by group (group with and against the shutdown system). Through this study some implication could be obtained for the difference in trust between two groups.