The Ching family is a wealthy family that produces textiles for the royal family, government officials, and the army during the Tang Dynasty. Circumstances force the Ching's 4th son, Ching Chi Hin, to marry Dun Ju, the daughter of a Tibetan general. However, their relationship is plagued by misunderstandings and mutual hatred. The two remain in a loveless marriage, with Dun Ju wanting to return to Tibet and Chi Hin nicknaming her "stupid pig" because her name Dun Ju sounds the same as "stupid pig" in Chinese. One day, she encounters Luk Dung Jaun, a Tibetan government official, on the streets of the Tang capital. He tells her he is on a secret mission and asks for her help, promising that he will take her back to Tibet once they complete their mission. Their task is to find the long-lost illegitimate son of the Tibetan Emperor. The clues to finding this person are a gold butterfly pendant, a piece of jade, and a birthmark on the person's chest.
