I recommend "The Second Young Master Xue of the Dream of the Red Chamber Has Space" and "Dream of the Dream of the Red Chamber". These two books were about crossing the Dream of the Red Chamber, and the main characters had the help of the space system. The former was about how Xue Hong transmigrated to become Xue Pan's younger brother and how he rose up in the official world after obtaining the space system. The latter was the story of a modern girl who transmigrated to become Daiyu in the Dream of the Red Chamber. She also had a mysterious space. I hope you like this fairy's recommendation. Muah ~š