The story begins in the late 1960s. Gao Xiulan (played by Hao Yan)'s husband passed away, leaving her with four children, one girl and three boys. Her life was very difficult. At this time, someone introduced her to the boilerman Lao Guantou (played by Li Youbin), and Xiulan felt that she had someone to rely on again. After the two got married, the children felt that their mother had transferred her feelings to her stepfather, so they became antagonistic. Faced with this group of difficult-to-discipline children, Lao Guantou had the idea of leaving several times, but because he was reluctant to give up his beloved Xiulan, he thought about it and let it go. Time passed quickly, and Xiulan never heard the children call Lao Guantou dad until she died. She left the world with regret. Not long after Xiulan passed away, Lao Guantou also passed away. When the children were sorting out his relics, they found that in an old box, it was full of calendar cards since he entered the family. When they saw the various contents recorded on it, the children burst into tears...