In the 1970s, railway worker Zhao Jianguo and female coal mine worker Li Xiuying were matched by someone, and they met for life as soon as they met each other. From then on, they began a six-year period of letter-writing and separation between the two places. As time goes by, their daughter Zhao Jingtong grows up in the wave of the new century and faces the problems of the times: her husband is unemployed and his financial management is defrauded. Both generations have experienced their own "difficulties" and "tiredness" in the torrent of their respective eras. However, the responsibility and tenacity of the fathers, like a light in the dark night, and the almost stubborn protection of family and commitments, quietly illuminate the hesitant steps of the next generation. This is not only a chronicle of a family, but also a profound ode to how ordinary Chinese people use love and persistence to overcome great changes.
