The weasel spirit Lu Qinghe fails in his attempt to obtain a title from humans. Disguised as a woman by Daoist Songyun, he is sent to the Duke's mansion to pose as their long-lost true daughter. The real heiress, Lu Mingzhu, is repeatedly provoked into testing Qinghe by the fake young master, Lu Chengxiao, but gradually warms to Qinghe's simple sincerity and instinct to protect others. As events unfold, Qinghe's male identity, demonic form, and the blessings of the Dragon Maiden are successively revealed through a snow lotus expedition in the snowy mountains, a snow lotus offering at a banquet, and a rain-prayer ceremony at the Dragon Maiden Temple. Meanwhile, Chengxiao's conspiracy with foreign enemies is exposed. In the end, Qinghe receives the Dragon Maiden's blessing on the border battlefield, protects the grain supplies and saves the people. His determination to defend the land earns the recognition of the Heavenly Dao. Finally understanding his true heart, he no longer fights over his bloodline or identity. Instead, he takes charge of the Great Yin Empire with sincerity, finds lasting love with Mingzhu, and celebrates peace alongside the Duke's mansion, Songyun Temple, and countless ordinary families.