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After traveling back in time, she became a girl who was moved to live in a nunnery in the suburbs because she had a conflicting future with her father. In order to be able to stay with the person she likes, she had to resort to means. However, by mistake, revealing herself attracted the covetousness of the domineering prince. He gave her the glamorous title of princess just because he wanted a weapon that could intimidate the back court. Stepping into the splendor and beauty, a house full of delicate concubines, a murderous back house, and the entanglements of the past... He was not the lover she wanted, but he had no choice but to be involved in this gorgeous cage. How can she make herself happy in such a life that is gradually breaking away from calculations?