A story about a younger sister who has been continuously threatened by her older sister, a saintess beloved by God, saying that if the saintess is treated carelessly, calamity will befall the kingdom. The younger sister, asked by the crown prince, strategically breaks off the engagement between her sister and him.

One day, my older sister suddenly claimed to be a saint, saying that disasters would befall the country if I disobeyed her... and indeed, every time I went against my sister and every time she grew angry, calamities struck our household. My parents and I, her younger sister, who had been subjected to my sister's reign of terror, were finally relieved when she was chosen as the Crown Prince's fiancée, thinking the disasters would be limited to the royal palace and we'd finally be free of her... but then His Highness came to our house asking us to help break off the engagement, saying he couldn't take it anymore... and I, terrified that the country would perish if we didn't do something about her, decided to come up with a plan to deal with my sister...