From the loess slopes in Haidong, Qinghai, to Wutong Road in Xi'an, to Mingsha Mountain in Dunhuang, to the Yangtze River in Wuhan, and finally to the locomotive depot in Golmud - Lin Mo and Su He, two young people with their own regional imprints and life trajectories, slowly approached in the torrent of time, but had to face separation due to the gravity of reality.