This mixed-methods research project documents the school culture of Hope University's Language Institute and reveals the reciprocal relationship between the school culture and the instructional practices of the English as a foreign language (EFL) teachers in this particular institute. Altogether, 62 EFL teachers agreed to complete a questionnaire. Of these, 14 participated in semi-structured interviews and classroom observations; 2 agreed to be interviewed but did not allow their classrooms to be observed. Quantitative data demonstrated strong correlations among eight social organizational variables of a school culture. Qualitative data further revealed the influences of a school culture on these teacher participants' instructional practices.