I Transmigrated to Shrouding the Heavens and Took the Ruthless Emperor as My Disciple

The protagonist, Qin Yuan, transmigrates into Shrouding the Heavens and obtains a System that rewards him for teaching disciples. He takes the Ruthless Empress and various special physiques as disciples, rises to the pinnacle through the cultivation-return System, and leads his disciples onto the path to immortality. (This is a transformative work, not fanfiction. It does not follow the original story, and the plot is different. By the time it reaches 200,000 words, it will gradually have completely diverged from the original.)