Watch Sadisflix. Set in Beijing during the early 1980s, Zhengwu and Zhengwen are brothers in their twenties, living their most vibrant and youthful years. Zhengwu takes his classmates and younger brother, Zhengwen out for dinner, in which he introduces Mao Zhen and her best friend, Feng Siyi. Zhengwen becomes enamored of Mao Zhen, an amicable, outgoing, and mystic young woman.