Is it really that different in the novel? Since I didn’t read the novel I’ve been theorizing the whole time, and that’s what I thought was happening—that she was enjoying herself as Reeze, hence why she wanted the story to go on forever and ever.
It is.
Basically; the novel adds in a lot more pre-death backstory where she’s essentially a complete bitch. She constantly anonymously posts malicious comments about new books coming out, without ever feeling guilty. She started a writing union under the guise of helping others but is really just to let her insult them. And when one of them got a hit she ramped up the malicious comments and insults, even impersonating their family to do so.
After that she’s sued and becomes further obsessed with her one decent book until she can’t separate reality from fiction and ends up killing herself and being reborn as Reeze.
That part of the novel is expanded on a lot and likely would’ve filled a chapter of the manhwa if they’d kept it.
As Reeze she‘s incredibly happy to be Reeze and never wants to fight against the plot, she just gets bored and wants to make the journey more exciting while keeping the plot. She doesn’t have a moment, the way she does here, where she tries to fight against it. She doesn’t spend a year anxiously trying to break out of the story before snapping the way she does here.
So she just comes across here more like she’s a victim who accidentally died and went to, essentially, hell then snapped whereas in the book she’s just a bitch from day one who always loves her new life. Actually there’s a small line in the novel that highlights how reliving the same life over and over is essentially hell but that she doesn’t admit that to herself and instead she starts the game “Edith Possession” unlike here where the possession just happens without her actively making it happen.
So yeah
TLDR: Novel Reeze (Lizzy) is a bitch from day one who does everything intentionally, Manhwa Reeze is a victim who things happen to and who snapped after living through hell.