During the Yuanyou period of the Northern Song Dynasty, modern archeology professor Xu Minglan accidentally traveled through time and woke up with a mysterious mark. On the streets of Bianjing, I met a daughter of a clan who was disguised as a man. The imperial study contained a thousand-year mystery of time and space. Deep in the underground palace, the "eyes of the sea" were slowly opening their eyes. The intrigues of the palace are intertwined with the love between his children. Can he find his way back and keep his true heart in this era that does not belong to him?