People say that if other's opinion agree with their own, that's right, if oher's opinion doesn't agree with their' own, that' wrong. Therefore it is possible that rightness is not truly right, absolute belief about rightness is even dangerous. Controversy for development can result in disorder and crash on the contrary. This thesis investigate Quboyu's 'Realization of wrong', focusing on wrong rather than right. Kongzi think much of Quboyu who doesn't realize past forty-nine year worng until he becomes fifty years old. His realization influenced on Korea-Chinese writers. His 'Realization of wrong' is self reflection between practical and ontology viewpoints. The former is the practical realization which intend change of attitude, the latter is self examination that makes people realize universal ego among others. These multilateral introspections help people make their own moral characters.