In the mythical story, Legend of the White Snake, the immortal herb that Lady White stole was ginseng. Ginseng was an ancient plant that was said to be able to increase one's lifespan and practice martial arts. It also had magical medicinal value. In the story, Lady White resorted to all kinds of means, including deception, theft, and so on, in order to obtain ginseng. In the end, she successfully stole the ginseng and brought it back to Xu Xian's house, adding some magical power to their love.