I read from a spoiler somewhere but im not sure if i got it quite right
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I think the curse is that whenever someone reads the book, everything starts from the very beginning again. Everyone's memory is wiped out except for yuri's and thats why her personality is different than the original.
I forgot where i saw this but if i got it wrong huhu im sorry maybe its just my imagination ╥﹏╥
Oh to be a female lead in a manhwa full of handsome men ╥﹏╥