She is a genius girl with an IQ of 280, who easily runs the world's largest drugstore. She is as beautiful and dangerous as a rose. She is arrogant and smart, but she dodges between them. He is a handsome young man from a wealthy family and enjoys the honorary title of "Angel Young Master". He is the most beautiful "demon killer", cold and ruthless, but he is attentive and considerate to her alone. She is caught in the love of three people and cannot escape. When the wheel of fate stops between three people, how should she make this simple but cruel decision?