Stuck as an extra in the novel

Our mc, Song In found himself in a novel that he once read. However, there are a lot of tragedy that will happen in the future. Song In decide to interfere with some of the plot event. don't take this novel seriously. So inform me if you want me to take it down -I do NOT own the picture - I am not korean so pls understand if I made some cultural mistake and do comment to inform me about it.