The reborn second daughter of the Bai family, Bai Jiao, determined that marrying the martial man Huo Yan would lead to widowhood and that marrying the scholar Xu Xiucai would allow her to become a noble lady, publicly tore up the Huo family's betrothal document, and forced her time-traveling elder sister Bai Wei to take her place in marriage through threats of death. Bai Wei possesses the spiritual butterfly supernatural ability, and long knew that Xu Xiucai is habitually abusive, while Huo Yan, although facing a mortal tribulation, is reliable in character. In the end, Bai Jiao is swindled out of her private money and waits in vain without returning while still stubborn in speech, whereas Bai Wei helps her husband avoid the mortal tribulation and their family business gradually prospers, completely reversing and swapping the fates of the two sisters.