This study has carried out phenomenological qualitative study to explore what kind of perspective on the class students have formed through face-to-face classes and how changed during the COVID-19 period of perspective on the class due to online classes. The study tried to reveal the factual strctures of the students' perspective on the class in the Normal University using phenomenological methods such as cessation of judgment, phenomenological reduction, and oriented analysis. As a result of the study, the study participants recognized the class as an activity with duality. Duality means that classes pursue various ideals of “activity” based on constructivism, but in reality, they are activities with “set answers” for “university entrance exams.” As for textbooks, they had a dual perception of 'absolute truth' or 'being necessary only in school'. As for the evaluation, they pursued 'fairness', but they had a dual perception that it was actually 'unfair'. The 'interaction' with the teacher alleviated the duality of the class. In face-to-face classes, duality was alleviated through 'intimate' 'communication' and 'conversation' with teachers. However, in online classes, 'interaction' was 'deficient' and felt 'neglected', and the duality of the class was maximized. In online class situations, students chose reality. In order to succeed in the “university entrance exam”, tutoring or self-study was more advantageous than school classes. So they questioned the need for school classes. This study is meaningful in that it revealed what students experience and what view they have through face-to-face classes and online classes in terms of the context of classes, textbooks, class-related evaluations, and teacher-student interactions.