The Daughter of an Agent: I Will Live up to My Passing Years and Live up to You.

For the warmth he gave her, she devoted her whole life's wisdom to building a dark empire for him and helping him become a king, but in the end she was left dead. For the sake of his false pity, she devoted her whole life to strategizing and helped him become the emperor regardless of the opposition of her relatives. In the end, her family was destroyed and all her relatives died. She is agent Bing Xin, who once died and traveled to another world to become Shu Bingxin, the legitimate daughter of the prime minister. The two were connected by fate. Bingxin vowed to repay her kindness and revenge, build power, protect her relatives, and finally want to become a big world and want to be free. But what happened to the prince who had been standing behind her and wanted to be her backer?