This story begins with a time travel and ends with a return; it begins with a personal struggle and ends with the inheritance of civilization.
Xue Yun and Cui Niannu met and fell in love after returning to the Song Dynasty for thousands of years. They lived their own legends in the cracks of history. They may not have changed the direction of history, but they have changed the fate of millions of people, and they have preserved the possibility of another path for Chinese civilization overseas.
There are no ifs in history, but stories can. This story is an imagination of "what if" and an exploration of "possibility". If the Song Dynasty had not been conservative and autistic, if Chinese civilization had faced the ocean early, if... Perhaps, our history would have been different.