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The response to the coronavirus infection, which has been prevalent since 2020, is changing, and we are finally returning to a more peaceful routine. Although many people still cannot take off their masks, it has become a way of life to continue social life based on the “new normal”. In addition, today, we live in an age where we can easily communicate with others without meeting them in person through social networking services. These may be unique characteristics of modern people.

However, human emotions and feelings are expressed through their faces, and deciphering non-verbal information …