In the heart of Beijing, a secret society gathers under the cloak of night, their carnal desires forbidden by the state's moral codes. Among them is Li Mei, a seemingly demure woman by day, but by night, a tigress unleashed. She dominates her partners with a fierce intensity, their bodies entwined in a symphony of pleasure and pain. The room is filled with the sounds of their ragged breaths and the soft thud of flesh meeting flesh, a stark contrast to the silent city outside.