Set in late-Ming Dynasty China, *Sex and Zen* follows the scholarly and arrogant Wei Young-chi, a young man obsessed with purity, intellectual superiority, and the complete subjugation of women. Believing that physical intimacy is vulgar and that true
enlightenment comes only from classical texts, Wei sets out to marry Yu-fung, the exceptionally virtuous daughter of the pious iron-maker Tie. Despite Yu-fung’s initial hesitation, Wei uses his considerable eloquence and deceptive charm to win her hand, driven primarily by a ruthless desire to conquer the ultimate symbol of female chastity and prove his ideological dominance.Following the wedding, Wei’s obsession with physical perfection and sexual prowess quickly consumes him. He becomes deeply dissatisfied with conventional marital relations and seeks out new, increasingly extreme sensations. His relentless pursuit of hedonistic mastery leads him into the orbit of the eccentric, debauched vagrant known as the "Unfettered Scholar." Recognizing Wei’s immense ego, the Scholar takes the young man under his wing, introducing him to a bizarre philosophy that equates advanced
sexual experimentation with spiritual transcendence.Under the Scholar's toxic mentorship, Wei descends rapidly into moral decay. He abandons his scholarly pursuits, alienates his wife, and embarks on a frantic campaign of seduction and libertinism. His arrogance blinds him to the mounting consequences of his actions. He even orchestrates a complex and humiliating scheme involving Yu-fung, pushing her into the arms of a notorious local marquis to satisfy his own perverse desires for control and jealousy. However, this cruel manipulation backfires catastrophically, shattering Yu-fung’s spirit and driving her to a tragic, desperate end.As his world collapses, Wei’s physical and mental health deteriorates. The Unfettered Scholar betrays him, abandoning him to face the wrath of those he has wronged. Stripped of his wealth, status, and health, Wei contracts a debilitating venereal disease that serves as a physical manifestation of his internal rot. Facing imminent death, he finally achieves a moment of agonizing clarity. He realizes that his lifelong quest for superiority and sensory domination was a hollow illusion that destroyed everyone he claimed to love. The film culminates in a surreal, karmic awakening where Wei, broken and repentant, seeks redemption, ultimately castrating himself in a desperate bid to cleanse his soul and escape the endless cycle of carnal desire before drawing his final, sorrowful breath.