After I Transmigrated Into a Book, the Crazy Puppy Boy Won't Stop Clinging to Me

[Unhinged, love-starved yandere puppy VS a death-fearing punching bag with a System] After transmigrating into a book, she became the hapless villain of the story. To get away from the original male lead, all she wanted was to complete the main plot so she could make it safely to the end. With the script in hand and an all-knowing perspective, she was determined not to repeat the tragedy of becoming a cannon-fodder character, even if the book had been abandoned by its author. But then things absent from the original story threw her plans into disarray. Can someone explain what this crazed, clingy yandere puppy is doing, demanding cuddles and threatening her not to run away?