The setting that 'Ryu Yoonmi' had was quite lame in her opinion. The only purpose of her existence was to create unnecessary dramatic situations and help the main characters get together.
The intelligence that 'Yoonmi' possessed made her wonder about how the girl was able to live on for so long. Then again, seeing how she was merely a character in the novel, this was totally dependent on the author.
As cliché as it can get, 'Yoonmi' was the main villainess of the story— although making Yoonmi question how she was able to be that with her lack of IQ— and fiance of the male lead. The lack of creativity made Yoonmi shake her head at the author.
The relationship between the two of them was something Yoonmi was able to guess without having to read the novel.