After being trained as slaves, they all became masters of their own affairs.

Yu Ze traveled to an immortal world called "Shangcang" and obtained a "slave training system".
He had worked so hard to train the slaves, and then... he was backstabbed by one of them.
With the help of the system, Yu Ze returned to his former hometown, Biaoxing.
I thought I would spend some time in high school and college, and then live a beautiful and happy life.
However, soon after he traveled back in time, he discovered that there was an indescribable connection between his world and the world of 'God', and many travelers appeared one after another.
People enthusiastically discussed the names of powerful beings in the world of heaven that they had only heard of in rumors, and they were very yearning for them.
Yu Ze was dumbfounded.
What made him even more dumbfounded was that he actually saw the slaves he had adopted