As the scorching summer approaches, Wenxiangfang, a commoner's incense shop, faces malicious suppression and a cutoff of precious spices. Female shopkeeper Ye Banxia finds a way to survive in desperate straits, using cheap local mugwort and mint to develop affordable everyday mosquito-repellent incense for the common people. Facing heavy obstacles such as malicious merchants spreading rumors, framing her, and hoarding medicinal herbs, Banxia, with the help of medical officer Lu Ming and an old herbalist, tests the incense in the street to break the deadlock. Ultimately, with hard work and wisdom, she breaks the monopoly and reaps a happy romance.