After being betrayed by his business partners, Shen Yuan is stranded on a deserted island, where he forges a divine fishing rod with his own hands and ventures into the deep sea. He becomes famous overnight after catching an extraordinarily valuable giant grouper, but soon faces relentless suppression from the fishing industry association and the powerful Li Hao. His rivals secretly destroy his fish cages and release fish-repelling chemicals to sabotage him at every turn. Shen preserves all the evidence and strikes back one by one. He then ventures farther into the open ocean to capture colossal creatures weighing tens of thousands of tons, exposes the industry's monopolistic conspiracy, and finally settles the blood feud from his previous life.