After the Strategy Mission Failed, He Was so Yandere That He Just Wanted to Be in Power

[Wearing books + cousins + double cleanliness + nine-year age difference + long-planned + male protagonist is paranoid and possessive] Everyone knows that the Cui Mansion adopted Jiang Yue, who lost his parents at the age of six, for ten years. The noble and cold-hearted Chief Assistant dotes on her, teaches her all the skills, and cleans up her mess everywhere. Everyone sighed—— Lord Chief Assistant can be said to be the most competent brother in the capital. But only Jiang Yue knew that what he did was just a disguise! He desperately got rid of the men who appeared around her, and even her marriage fell through... What the world considers to be a model good brother imprisoned her on the bed and was her bedside person day and night. She was afraid of him, afraid of him, but the funny thing was that in the end, he had tears in his eyes and begged her pitifully: Love him a little more. —— "You have to go back." After being informed that the strategy mission was successfully completed, Jiang Yue was stunned, as if he understood something... Cui Chengyun held her in his arms at the last moment, his eyes were red, and the ends of her hair were wet with tears, "Let's go, congratulations, you can go home." "Zhaozhao, I will violate my principles and let you go willingly." Later, Jiang Yue understood that the principle he said was that he wanted her to be by his side forever, nothing more.