When did the summer from solstice to long summer end? Who did Chang Xia finally marry?

Before the solstice, the end of the TV series didn't say who Chang Xia was with. It's just a scene where two people meet, and it's represented by an open ending. In the original novel Summer Before the Solstice, Fu Xiaosi and Lu Zhiang's love for Long Summer has vanished because of the blackening of Cheng Qiqi! Because Cheng Qiqi was pregnant with Fu Xiaosi's child, Chang Xia chose to leave, left Fu Xiaosi and returned to Asakawa. It is said that Chang Xia married a mysterious man in Asakawa, which is not written in the novel.