This study explores the reflection of WhatsApp groups, one of the most popular means of communication style, between school principals and teachers upon teachers' professional lives. The research was designed using a qualitative model, and semi-structured interviews were used for data collection. The research group consisted of 26 teachers from primary and secondary schools. The data were analysed and interpreted according to themes. The results showed that some school principals with an autocratic leadership style used WhatsApp excessively and inappropriately, putting unnecessary pressure on their subordinates. Overall, the study highlights the importance of considering the impact of instant messaging on teachers when using WhatsApp in schools. The findings provide valuable insight into the influences of instant messaging on professional and personal lives and suggest a balance between the two to avoid detrimental effects on teachers' well-being.