This study deals with virtuality, the real occupied by the online after COVID-19, based on body perception, affect and the optical unconscious. As the recent discourses on the metaverse show, the online realm in our life is expanding, but this phenomenon is still considered to be unknown and has not been clarified. This thesis examines how virtuality has come to be new due to technology, but is already faced in art by human perception ability and explores it terms of the body that perceives it. To this end, Walter Benjamin’s concept of the “optical unconscious” and affect theory are discussed. Moreover, the characteristics of virtuality are also analyzed in the projection mapping art work Casting of Yiyun Kang.