Shen Qingci was originally the daughter of a merchant from the south of the Yangtze River and was good at calculations. However, due to a crime committed by her family, she accidentally ended up in the most prestigious brothel in the capital, the "Ruanhong Pavilion", and became a bookkeeper. She originally planned to hide her name, save enough money and run away. Unexpectedly, on the first day of business, she met Li Chengze, the most powerful and love-minded Prince Jing in the dynasty. He spent a lot of money on the oiran and almost emptied the money in the cabinet. Shen Qingci looked at the shocking deficit in the account book and silently pulled out the sandalwood abacus above his head. The prince's love brain is a disease that needs to be cured. Use abacus to cure.