I Have a Very Random Portal

One night, Bai Yan, who was in the second grade of middle school, had just finished watching a movie. His soul in the second grade was burning and he shouted at the wall, open the door. As he said, a gate really appeared on the wall. After testing, Bai Yan found that it was a very random portal. Different gestures to open the door would lead to different worlds inside the door, so Bai Yan began to explore these strange, science fiction, or backward worlds.