Hu Sisi and Wang Xiaopin are newlyweds. After an argument, they fall into Long Lake, drown, and lose consciousness. When they open their eyes, they discover that they've transmigrated into the bodies of newborn twins, a boy and a girl, in ancient times. Though the two babies can't speak, they can hear each other's thoughts... Have they become siblings now??? Can Wang Xiaopin and Hu Sisi accept this reality? How will they put aside their modern-day love for each other and live as brother and sister in this feudal dynasty...?
