After Time Traveling, I Was Wanted by the Whole World of Immortality

He Chang, the author of the online article "Butterfly", traveled back in time to his own fantasy novel. The system said that if you transform into a supporting character and secretly correct all the errors, you can go home. He Chang secretly rejoiced: No one understands this world better than me. But... That's not right! How come the upright protagonist is practicing cult skills! How come the insidious villain is clamoring to save the world! And... Everyone is hunting me!