Zhu Xin is filled with a sense of powerlessness in the present and wants to find the Hangzhou of the past. And a river in front of his home, under the Phoenix Mountain, where there seems to be a portal, a thousand years ago Su Shi had written a Song lyrics. The lyrics, originally a song, had a rhythm between the lines that seemed like a call from his hometown. Together with Hong Kong lyricist Xiao Ke, he pursued the original pronunciation and melody of "Jiang Cheng Zi", but faced with the gaps in history, the original plan went off the real track, and the "hometown" in their hearts quietly changed its appearance. It is not only a documentary, but also a dramatic reconstruction of the creator himself and the gaps in history.