At the end of Zhenguan, Li Shimin, Emperor Taizong of the Tang Dynasty, was on his deathbed due to the recurrence of an old injury and longing for Concubine Cao who died young. He accidentally traveled to a modern seaside town in 2025 and was reborn as a thirty-year-old young body. He is rescued by Cao Feifei, a girl who runs a seafood restaurant, and she looks exactly like Concubine Cao from thousands of years ago.
Li Shimin stayed with Cao Feifei in the name of "Li Mo". From an "ancient man" who knew nothing about modern life, he gradually adapted to and became her support in life. The two had a secret love while getting along, but they repeatedly encountered the persecution of Cao Feifei's greedy uncle, the threat of the mysterious group "Shengshi", and the crisis of trust caused by Li Shimin's true identity.
As the truth about the death of Cao Feifei's parents gradually emerged, Li Shimin decided to return to the family as "Li Shimin, the second son of Shengshi Group", went deep into the tiger's den, and uncovered a shocking conspiracy involving illegal sand mining, forced demolition and murder. A love that spans a thousand years, in the intersection of two time and space, writes a modern legend of protection and revenge.
