Shen Yan, a modern marine engineer, wakes up to find himself transformed into a frail, sickly unwanted son of the Shen family, exiled to a deserted island in ancient times. With no water, food, or medicine and ruthless bandits lurking nearby, dozens of elderly and weak people are on the brink of death. While others await their fate, he uses seawater distillation to obtain fresh water, builds stone fish traps, improves salt production, and smelts iron to establish a village, gradually turning the barren island into a bustling trading hub. After repelling pirates, uniting three islands, and opening trade routes, prosperity seems within reach. But a mysterious letter uncovers a shocking old case: the massacre of the Shen family was actually a scapegoat in a political conspiracy at court. (This synopsis was generated by AI.)