The ability to communicate interculturally is considered a primary attribute in people conducting business globally. Recent studies suggest that training in ethnographic techniques helps people develop intercultural communication competence. Ethnographers are trained to observe and attempt to understand cultural "others" carefully. However, few studies demonstrate how business practitioners use ethnography for intercultural communication. This study analyzes data collected by longitudinal engagement with people who work in China-Japan intercultural workplaces. Chinese and Japanese share commonalities as well as differences. The relationship of the two cultural groups is not easily understood by applying ready-made cultural dimensions. To examine the participants’ behavior in this complex interculturality, in-depth unstructured interviews were conducted periodically over three years. Since the data collection period included the peak of the COVID-19 pandemic, the data also illustrate how the pandemic-induced constraints influenced the ethnographer-business practitioners. Two research questions were posed: "How do the business practitioners use ethnographic techniques to understand the "culturally similar" others? Moreover, “How does the pandemic situation influence their efforts?" The data demonstrate the participants’ use of persistent observation, working hypotheses building, data validation by peer debriefing and triangulation, and their application of the findings to their practice.