Xiao Che, the king of Yongning, was the proud son of heaven, but he only doted on the "ugly doctor's wife" Su Qingyuan who took care of her children, causing an uproar in the capital. No one knows that this favor stems from a deathbed promise to an old friend. Su Qingyuan, who was once a stunning beauty, was disfigured and widowed due to the plague, and was fortunately protected by Xiao Che. As we get along day and night, responsibility gradually gives rise to feelings, but the identity gap, secular rumors and the friendship of old friends are across the gap. A guardianship that begins with a promise will eventually blossom into unforgettable love despite numerous obstacles.
