Borrowing Money from the Big Bad Villain [Book Transmigration]

Yuan Ling ended up on the streets, broke and without legal status. With no other choice, she staked her life as collateral and borrowed money from a certain great demon king to open a dessert shop, promising to pay it all back within three years. At first, Yuan Ling only wanted to open a dessert shop to repay her debt, and hopefully earn enough to support herself. That's exactly what she did. Things probably changed after the great demon king confessed to her... A cold and ruthless celestial master showed up at the dessert shop, announcing that he would kill the great demon king to rid the world of evil. A kind and frail young woman often passed by the shop, and whenever she ran into the great demon king, she would twist her ankle or get into trouble and desperately need help. Even more inexplicably, people came by to lecture her, saying she was bound to suffer a bloody calamity within five years. Yuan Ling: ??? Do you even know I understand the occult too? What the hell do you mean, a bloody calamity in five years! It wasn't until later that Yuan Ling learned from a woman with an invisibility beam above her head: "This is a fictional world. The great demon king is the book's extremely terrifying villain, and the male lead kills him for all the evil he's done." Yuan Ling looked back at the man helping sweep the floor: "???"