Qin Xiaohe, a young girl from Qiangu Village carrying an ancient alliance, steps from the snowy mountain village into the bustling metropolis. Twenty-five years ago, their predecessors established a three-way engagement; she descends the mountain to fulfill the betrothal and call off the marriage, investigating the layer upon layer of suspicious doubts hidden behind the medicinal herbs. Along the way, she meets Cheng Wei'an, who has encountered misfortune. Relying on ancestral medical skills and the assistance of her natal gu insect, she parts the layers of fog. She adheres to her original intention, pursues the truth, protects those around her, steadfastly maintains kindness and morality amidst grievances and entanglements, breaks through the dilemmas set by others, and walks out her own path of growth amidst the hustle and bustle of the secular world.