MTL - Mysterious Young Master, Super Cool

“From today onward, you’ll take your brother’s place and take over the inheritance of the Gu family!” With her mother’s declaration, she became her twin brother’s substitute. Dressed as a man, but unwittingly enticed a lot of sisters! Incidentally, she also captivated the younger sister of the most powerful authority in China, shouting to marry her! Ming Shao was furious: “From now on, you will follow me. I will train you to be a qualified brother-in-law!” Since then, she eats with Ming Shao during the day and lives with Ming Shao at night. She has always thought that Ming Shao treats her as a prospect brother-in-law, but one day, Ming Shao pushed her down the bed and plundered her mouth! Hey! Didn’t he say he wants her to be his brother-in-law, how come he turned into her boyfriend? - Description from Novelupdates