A man possessing ancestral medical and martial arts skills descends from the mountains to seek his fortune. To land a job at a renowned hospital, he undergoes the director's test—curing the director's daughter's intractable sexual frigidity. Unexpectedly, upon their first meeting, he recognizes the woman as the stranger he witnessed being intimate with his girlfriend in the square, instantly escalating the awkwardness and tension between them.
To unblock her obstructed meridians, the man proposes a daring treatment involving acupuncture performed entirely naked to harmonize yin and yang. During the somewhat reluctant treatment, they cross the line, and the woman unexpectedly experiences unprecedented pleasure, with her physical symptoms significantly alleviated.
Even more shocking, the woman discovers her husband secretly covets her mother, a twisted relationship the man was already aware of.
