Recently, there has been a growing number of second-career teachers who choose to re-enter the teaching profession from different jobs. Is the entry of second-career teachers into the teaching profession a positive driver for change in teaching society or a conservative driver? In order to find the answer to this question, this study noted the study of Lortie(1975), a classic of teaching socialization and teaching culture. He regards second career teachers as conservative drivers, whereas Wilkins et al.(2017) describe a second career teachers as driver of change within teaching profession. Taking these conflicting hypotheses into consideration, a theoretical framework was developed to explore them in light of the study of Crow and colleagues(Crow et al., 1990) who had categorized second-career teachers as homecomers, the converted, and the unconverted. Findings demonstrated that the homecomers showed their conservatism because of their satisfaction and stability with their chosen teaching position in consistent with Lortie s argument. In the case of the converted, they showed progressive and active aspects at first, but soon assimilated with the existing teaching culture. With the regard to the unconverted, they showed a lack of commitment to devotion, showing that they had not settled in teaching. However, the distinction between these three type of homecomers, the converted, and the unconverted in our sample were found to be not as sharp as in the study of Crow et al.(1990). Based on the findings of these studies, second-career teachers gave in-depth descriptions of implications for teacher education and teaching positions.