Most importantly all of their power levels increased in a tremendous amount. Their spiritual roots, meridians and their constitution also refined and upgraded at a rapid rate.
Yue Ling already reached the maximum level in one go because of Mu Chen. She cannot advance hereafter in this world, even if she cultivates it for another thousand years. Because this world cannot have that much capacity to increase the level of the cultivator.
Tang Li and Zhao Feng also decide to bring Mu Chen out of this world with them. They had a hunch that Mu Chen won't get any better if he stayed in this world. This world has very low potential to produce peerless experts .
If Yue Ling wishes to go with them, they will return jointly.
White cat watched the changes in the atmosphere calmly while sitting behind Mu Chen who was lying unconsciously.