I mean in the novel she did sorta have one but it was just that she was bored of the cycle and reincarnating Edith’s just to kill them (and to make her seem “amazing””kind” etc.). She was a literal psychopath who never learned why that was wrong. Also I think it hinted that she never grew up to live adulthood (like 16-18ish?). But idk my memory from the novel is getting messed up thanks to the manhua changes ;(
That's what I mean. In the novel, her back story makes sense. In the manwha, it doesn't. Here, she wants to go to the real world that she even changed the end of the original story but still went back in time, but Edith changing the ending stopped that regretion?
In the novel she was so obsessed with Reeze and her only successful work that she didn't want any change and didn't want to accept her work was boring (also keep being young as Reeze) and that's why she didn't want Edith to win.

Giving Reeze that backstory doesn't make any sense.