The universe is a multi-dimensional space. There are dozens of different (one) dimensions, two dimensions, three dimensions... Zero and zero in total, and the only one we are familiar with is the one we are in - the third dimension (i. E. Reality)
Generally speaking, Muggles (ordinary people) living in the third dimension will live in the third dimension throughout their lives. However, there are some exceptions, and they are lucky enough to travel to other dimensions. Feng Mengyou, the son of the Feng family, is one of them. What he is going to is the dream in the hearts of hundreds of millions of otakus - the second dimension
