Lin Wan'er, a modern beauty influencer, unexpectedly travels back to the Tang Dynasty and becomes a low-ranking servant girl being treated as a commodity. In her desperate situation, she turns her fate around using the modern cosmetic formulas she mastered in her previous life. Her uniquely created Divine Lip Rouge becomes all the rage in Chang'an's Western Market, where she meets Crown Prince Li Chongyi, who secretly conducts business. The two gradually develop feelings for each other while working as business partners. She repeatedly faces schemes and oppression from her competitors at Baoyan Pavilion, powerful ministers, and the renowned cosmetics master Liu Ruyan, but overcomes every crisis with innovative makeup products and clever strategies. With her advanced aesthetic vision and exclusive formulas, she wins the favor of the Empress and Princess Changle, secures the exclusive right to supply cosmetics to the imperial court, and transforms Nishang Workshop into one of the Tang Dynasty's leading beauty businesses.