A shadow falls over Chang'an City as whispers spread about Black Tea, an enigmatic herb appearing just as young brides begin vanishing without a trace. General Lingfeng, commander of the elite Jin Wu guards, finds himself plunged into a desperate search for answers. His investigation takes an unexpected turn when he crosses paths with Su Wuming, a brilliant and observant detective mentored by the legendary Di Renjie. Bound together by the unfolding crisis, they must navigate a treacherous landscape of supernatural occurrences and shadowy plots that threaten to consume the entire city.