Once upon a time there was an ancient secret that was magical and powerful. No one knows how it appeared. Suddenly one day, it disappeared. This civilization was also buried in the dust.
Gradually, mankind will begin to have a new civilization. With the rapid development of science and technology, the times are updating and human beings are making progress. But humans still had no way of knowing this secret technique, so they set up a specialized organization - the Mystery Group.
Intention: Online classes are boring