Where Are You When All the Flowers Have Fallen?

A wedding, the fate of three people, traveling through a thousand years, during the Zhenguan period, Princess Gaoyang, Bian Ji, King Wu Li Ke, well-known figures in history, how will the historical trajectory change? Li Shimin, Li Zhi, Wu Meiniang, Changsun Wuji, what will be the fate of these historical figures? When the prosperity comes to an end, where will he, him, and she go?