Inside a novel as an extra character

[Thank to ChatGPT, for correcting the chapters./Note: Only starting from the second chapter, the first chapter contains a word that does not meet the Policy of ChatGPT]

[Warning: The novel will contain mature and sexual content. If you are under the appropriate age, do not read. There will be explicit content ]

He died from exhaustion because he overworked himself studying, but instead of his life ending, he found himself waking up in a body that wasn’t his. Now, he needs to adapt to this new situation. But imagine his surprise when he discovered that he was living in the body of a side character who was supposed to die before the story even began.

(The photo is not mine. I don’t mind changing it if its owner wants to.)