In 223 BC, the King of Witch of the State of Xia died suddenly. Yan Rong, the king of mountains in the State of Yan, sent his nephew Yan Yunmo to enter the valley with the King of Witch's pre death prophecy.Sang Ruochu, who had followed the wet nurse since childhood, ran into Yan Yunmo's army because of a small white fox when sneaking out of the valley. To save the small white fox, Sang Ruochu took Yan Yunmo's army through the twilight forest with Mu Yuxuan's orders.When Yan Yunmo's army swept across the valley, Sang Ruochu left the valley in the name of Mu Chenxi, a rural teenager, and returned to the troubled country of Yan.Ten years later, one is an ignorant and innocent official daughter, one is a foreign wizard king in white, and the other is a ruthless royal son. After several encounters, acquaintances, and sympathies, when wordless feelings linger in the meantime, an edict pulls the three people who have deviated from their destiny onto the cogwheel.