😋According to the plot information you provided, I recommend " The Evil Emperor's Favor: The Mad Agent Queen ". The story was about Qian Yeyue who had transmigrated to the Cold Palace and lost her memory. She only remembered that she had to protect the biggest BOSS and became Mu Lingjue's executioner. She helped Mu Lingjue assassinate everywhere and conquer the world. It was not until she regained her memory that she realized that she was helping her enemy. I hope you like my recommendation.😗