After Wearing the Book, I Hugged the Boss Tightly and Never Let Go

Yun Ziyou slipped into the book, and she was still in the book she had just finished reading. There was also a system that inexplicably told her that she had to complete her mission in this world in order not to be obliterated. But who will tell her why the mission is to defeat the ruthless villain? Woo~ There is no way, she will die if she doesn't finish it, no matter how difficult it is, she will persevere!