what's that manwha???

the one where the mc possessed the main character of the novel (?) she read. and she actually did everything according to the novel, however, when she reach the "ending" of the novel she fainted, and was comatose. when she woke up, the supposedly ml of the novel broke of their engagement coz he apparently fell in love with another girl who wasn't mentioned in the original novel. and so does the other male characters that was supposed to be in love with the mc or friends with abandoned her too because they also fell in love with the other girl.... the end lol. please help huhu