Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 17 - 17-27. Authorities on Loan

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

Jiang Li, the legitimate daughter of a noble house, has traveled through time, becoming an insignificant character in a domineering CEO romance, who quickly meets her demise.Confronted with the most saintly female lead and the domineering male lead of the novel, Jiang Li instantly decides to stay away from these two 'idiots', focusing instead on making her own family illustrious.What to do with her genuine brother, who plays a lovestruck second male lead and is a complete wastrel?Jiang Li ships him off to a transformational variety show where the prodigal son becomes instantly famous, eventually becoming a movie emperor;What about the illegitimate younger brother who's always acting like a goody two shoes to win favor in the family?Jiang Li leads by example as the top student, turning the faker into a model student, and paves his way from undergraduate to doctoral studies;And what of her autistic cousin who constantly locks himself away in a dark room, weeping?Jiang Li prescribes the right remedy, turning the melancholic poet into the king of songs at the Temple of Heaven, his love ballads bringing millions of young girls to tears;Thus, the once wavering and declining noble Jiang family rises under Jiang Li's management, becoming the most respected and well-mannered leading family in the capital.The first time Jiang Li meets that man, he had just finished chasing a herd of runaway cows, his face redder than the sun with high altitude flush.He extends his hand to her with a grin, introducing himself, “Hello, I am Zhao Daniu.”Jiang Li stares at his muddy hand, still emitting an unidentified smell: “......” A silent rejection, thank you.Upon their next encounter, he has transformed completely, now the distinguished and formidable heir of the Gu family, his presence as refreshing as a breeze in the moonlight, peerlessly noble.He extends his hand again: “Hello, I am Gu Yu, I hear your family is in need of a man to take charge, do you think I'm suitable?”All members of the Jiang family leap out: “No! We don't need one!”

Regaining the memories of his previous life, Cyril realised that he was an otome game’s character, the villainous daughter– Sophia’s butler.At the rate things were going, Sophia would eventually have the prince stolen away from her by the heroine, fall into darkness, and be executed.Wanting to save the villainous daughter he was so fond of, Cyril moved to eliminate all the factors that would cause her to fall into darkness, raising her up to be a talented and beautiful girl who could win the prince’s love, however…