Former aquatic technician Chen Zhiyuan, following his master's teaching 'Better lean than dirty,' returned home to guard a shrimp pond for fifteen years. He insisted on natural spring water and ancient maintenance methods, refusing illegal veterinary drugs. Every Spring Equinox, he mailed a wordless bamboo painting letter to his deceased master, and the old watch on his wrist was a punctuality keepsake left by his father. His daughter Xiaoman returned and slowly understood her father's past hidden in notebooks and old photos. Former colleague Old Liu came to apologize, and everyone understood his persistence. After graduation, Xiaoman returned home to help raise shrimp, and everyone gathered by the pond. Fifteen years of persistence finally achieved fulfillment—a pond of clear, fresh shrimp, passing on the pure original intention of breeding and farming.