Abstract: In qualitative research (focus group) interviews, the host's perception of self-identity affects the trend of data collection. However, the existing literature rarely discusses host's identity, worldview and the flow construction of social reality. This reflection presents the conflict among the three teaching assistants' understanding of the identity of the host: Should the host focus on explaining the interviewee more, looking for preset answers, or guiding the interviewee to self-critical reflection? These three identities are closely related to the paradigm of the host. Interpretivism, post-positivism, and criticism will guide the host to adopt a completely different approach to interviews. Through reflection, the author finds that interviews based on these three paradigms have their own advantages and limitations, and researchers should clarify the underlying mechanism of the research "story" presented at the end.