Lu Chuan, a watermelon wholesaler, predicts that torrential rain will arrive and the Dragon Boat Festival market window will soon close. He urges the watermelon farmers of Xiling Village to sell their crops at high prices to avoid losses, but instead, they are incited by influencer Zhao Ya to insult him. When the rain arrives, their watermelons become waterlogged and rot, ruining the market. Zhao Ya runs away, and the desperate farmers beg Lu Chuan to buy their produce. However, Lu Chuan stands by his principles and reputation, offering only to help them cut their losses by purchasing the watermelons at low prices. The farmers lose their entire investment and finally understand the importance of securing their profits before it is too late.