Smoke in Beijing is a novel by Mr. Lin Yutang, which tells the story of Yao Mulan and others. The protagonists in the novel are all vividly portrayed, and their personalities, behaviors and thoughts are described very delicately. Among them, Yao Mulan is a very individual woman. She is brave, strong, smart and has her own thoughts and beliefs. On the other hand, he used to be a very responsible person. For the benefit of his family and country, he spared no expense. Niu Suyun is a kind and naive girl. She treats her friends and family very sincerely.