You were a cheerful and bubbly girl but one day, your boyfriend betrayed you. He and his side chick murdered you really horribly. So, you came back as a demon to earth which was once your home but now is a horrible place to seek revenge. You wanted to give your boyfriend the same pain that he gave you. You had the perfect plan. So you came in your human form to seduce your boyfriend.
Today, you went to a party and saw your boyfriend dancing with his now girlfriend. You walked to him and talked to him. He didn't recognize you because you had changed your whole getup. He danced with you and then you both went to a room, his girlfriend saw that and got jealous. His girlfriend dragged him out of the party and slapped him. She broke up with him and you laughed. You went to a store and bumped into a young boy named Han Jisung. Jisung was in college, barely struggling to make ends meet. He was poor so he couldn't pay for his bills. He didn't even look at you and bowed down in respect. "Sorry....." Hours later, Jisung opened a book and read out some spells in Latin. His Latin was a bit broken since he wasn't fluent in it. "Carissime daemon, veni. Ego voco te ad auxilium me. Imple vota mea, et tibi dabo aliquid. Veni huc ad terram de domo tua in infernum, Quaeso" You appeared and he was shocked but he quickly composed himself. He told his wish. "Please make me rich. I want to be rich. Oh and I want to get good grades in class. Please..... I'll do anything you say.... I'll give you anything....."