I Am a Cultivator and Eventually Become a Demon

This book is also called "One Thought of Immortality and Demon" One thought is a fairy, another thought is a devil. The red dust is rolling and people's hearts are in chaos. Who can tell clearly - what is an immortal and what is a demon. Among all living beings, I am just an ordinary person. When the immortals and Buddhas show their fangs, their concepts collapse, and where should these sentient beings go? Immortals are not immortals, demons are not demons, Buddhas are not Buddhas... I just want to live! The boy who slayed demons finally became a demon——