Another Path Taken [Old]

In a fit of anger, Han ranted in a comment section of a tragedy novel he had just finished. The author asked him if he wished to change the ending and he said yes. It was a fatal mistake because immediately after, he was struck by lightning and got teleported into the world in the book! Now he had to turn the protagonist, Jiang Ruhua, and the antagonist, Alwyn, into morally upstanding heroes.