The purpose of this study is to explore how full-time mothers constitute different lives according to agency in the process of practicing motherhood. To do this, qualitative research using narrative inquiry was conducted. Two full-time mothers participated in the interview. The findings of the study can be summarized as follows. First, participants were practicing different motherhood depending on how they understood the socially institutionalized maternity. The mother who defined maternity as unrealistic myth pursued to practice realistic motherhood. On the other hand, the mother who defined motherhood it as what can be accomplished with effort tried to practice it through learning. Second, in the process of practicing motherhood, each participant showed different agency. One showed living unlike her mother to reject the socially institutionalized maternity, the other showed learning motherhood’ in order to be a perfect mother. Third, the agency that each participant showed was the result of reflection or frustration. Based on the results of the study, educational implications were suggested