Marriage to a Cruel Prince, the Strategy Manual Contains Secrets

On the day we broke off the engagement, I was offered a marriage to the most ruthless and cruel prince in the capital. I dug out the strategy manual in the marriage contract and prepared to save myself. Unexpectedly, the prince pinned me against the wall and coldly recited the sultry words I wrote in item 38. But I forgot - this manual was written by me before I lost my memory, and the man in front of me is the incarnation of the system I used to deceive and abandon.