68-year-old widowed Su Changshan holds a shabby hard cardboard sign reading "pension 2,800, no house, no car" in the park's matchmaking corner to find an old partner, and is humiliated by the crowd. Qin Xiuhua, a pork seller, steps forward to protect him, and the two immediately register their marriage. After the marriage, a greedy sister-in-law, a brick yard bully, and an ex-husband just released from prison come to pick quarrels one after another, but Su Changshan slaps faces with counter-attacks every time to protect his wife to the end. It turns out he is actually the anonymous founder of Shengfeng Group, a commercial helmsman with a hundred billion net worth. At the 30th anniversary celebration, he kneels on one knee in public, delivering his two hundred billion fortune to his wife. When the dust settles, the two return to the vegetable market, framing and cherishing that hard cardboard sign of their pledge of love, staying together until their hair turns white without parting.