Brother, Can You Change Your Gender? It's Impossible for Us.

Lin Yitang has a stupid twin brother Lin Yichun. He read a few books about knight-errants, but refused to read them properly and insisted on becoming a young knight who performed chivalry and righteousness. General Lin was so angry that he almost beat the traitor until he could no longer take care of himself, but unfortunately he couldn't find anyone. Lin Yitang worked as a gunman and helped his younger brother get admitted to the Imperial Academy, the most prestigious institution in the capital. At the begging of his old father, he had to help Lin Yichun finish the last month of classes. Xie Changyan, a classmate who suffers from prosopagnosia and has not been seen for three years, recognized the only face during the entrance exam. Three years later, he returned to the Imperial College and found out that the owner of the face was Lin Yichun, who was also his deskmate. What he didn't know was that Lin Yichun also had a twin sister...