After Being Expelled From The Teacher, I Became The Villain Mentor

Yu Nian is a high school teacher. After being angry to death by his weird parents, he became the cannon fodder female supporting character in the Cultivation novel. She is amazingly talented and beautiful, but she is just a stepping stone for the heroine.
In order to survive, Yu Nian ran away to a down-and-out sect issued by the system to set up his own school, and also accepted three apprentices.
The eldest disciple is a reborn villain, the second disciple is a bloodthirsty demon cultivator, and the third disciple is a poison medicine genius, all of them are wandering on the edge of darkness.
However, it’s not over yet. No matter where Yu Nian goes, a villain will always follow and become her apprentice.
Yu Nian fell into deep thought and silently looked at his [Right Path Immortal Master] system.
Is this, laid-off and re-employed?
From then on, Yu Nian began to cultivate her apprentice conscientiously. The apprentice had a good foundation, but she gradually went astray.
Disciples:...?
Why Master is more like a villain than us.