Wen Yue, a divorced single mother, runs a private restaurant with her daughter. Lu Yushen, a mysterious regular customer, comes every day at noon, rain or shine, always ordering a bowl of Mrs. Lu's soup. With a little help from her adorable daughter, a trial-boyfriend contract turns their pretend romance into something real. Her ex-husband's fight for custody, pressure from a wealthy family, and a kidnapping crisis soon follow. It turns out that twenty years ago, the Wen family once saved the Lu family's lives. One bowl of soup, twenty years of searching for its familiar taste, and at last, the man who kept his promise has arrived.