The actual title is: After Falling into Demonic Cultivation, I Was Chosen as a Puppet Saint, So I Can Only Dual Cultivate. After Ye Ze transmigrates to another world, he sees through human nature after enduring all kinds of trials.
He awakens the God of Slaughter System. Thinking he would have to kill his way across the world, he is instead captured by an old demon and made into a puppet Saint. But his System suddenly awakens an ability to choose, and he chooses the dual cultivation technique to increase his cultivation.