After Becoming Trained Slaves, They All Flipped the Table and Became the Masters

Yu Ze transmigrated into a xianxia world called “Upper Firmament” and obtained a “Slave Training System.” After finally putting in the hard work to train his slaves into capable talents… he was stabbed in the back by one of them. With the help of the system, Yu Ze returned to his former homeworld, Star Surface. He originally thought he would just live out an ordinary high school and college life, and then go on to enjoy a happy future. However, not long after returning, he discovered that his world had formed an indescribable connection with the “Upper Firmament” world, and more and more transmigrators began appearing. People enthusiastically discussed the great powers of the Upper Firm...