Yang Kai had already become exceptionally famous also in the 3000 worlds, but still there was no sign anyone would start encouraging kids to start cultivating the dao of space. There's something wrong about all of these people. How can Yang Kai remain the only person who would see the benefit of it (aside from that one guy from Star Boundary we haven't seen since)? At least Yang Kai took a disciple, but logically there should also be hundreds if not thousands of young disciples trying their luck with it. So what if it's difficult? Is cultivation suppose to be easy?