Yu Minmin, a white-collar woman in the 21st century, travels through time and space to an imaginary era. The "Eastern Kingdom" descends from the sky into the palace of the second prince Shangguanqian of the "Eastern Kingdom", and a vigorous and tragic life of fighting for heirs, love, and love begins among the palaces. In the end, where does Yu Minmin's love go? Is it the eldest prince Shangguanchen who is as affectionate as the gurgling water, or the ambitious second prince Shangguanqian...