Objectives This study is to explore the experiences of high school teachers and university professors in online classes conducted after COVID-19, and to predict the future of online education in beauty majors, present directions for sustainable online education and contribute to the development of the field. Methods After COVID-19, data were collected based on the experiences of beauty high school teachers and university professors who had undergone full-fledged online education, and the operation method of online education was diagnosed, and the future was predicted. The analysis of the data focused on excluding the subjectivity of the researcher and revealing the meaning of the experience of the study participants using Giorgi's analysis method, a prominent phenomenological analysis method. Results In the question of the general experience of online classes, the study participants generally mentioned negative experiences. Participants in the study mentioned self-directed learning ability and digital device utilization ability as Student's necessary factors for sustainable online education, digital device utilization ability and class quality as Teacher's necessary factors, and resolution of difficulties in supporting and filming digital devices, and establishing accurate government guidelines and school programs as Technical necessary factors. In addition, regarding the prospect of online education for beauty majors, they said that online education has the advantage of time convenience and repetitive learning, and online beauty education will continue in the future. Conclusions Based on the experiences of teachers and professors who experienced online classes after COVID-19, this study found out the experiences of online education and the needs for sustainable online education, and presented the prospects of online beauty education, which is meaningful, but limited to some cases. Therefore, such research needs to lead to more verification of cases and opinions in the future, and more diverse opinions and solutions should be devised for sustainable online education.