Shen Xinghe, a young man from the modern world, unexpectedly finds himself transported to a deserted island with scarce supplies, where the entire village is on the verge of running out of food. A gigantic golden king crab suddenly appears on Black Reef Beach. Using his ingenuity, he crafts bamboo traps, dries salt, preserves seafood, and draws on his knowledge of the ocean to catch marine delicacies. He trades them with merchant ships for grain and iron tools. An ancient reef conceals a way back to his original world. When a storm strikes, he gives up his chance to return home, leading the villagers to build protective seawalls, prepare for disasters, and establish a stable seafood workshop. Determined to preserve the warmth and livelihood of their community, he uses his own hands to carve out a lasting and secure future for everyone on the deserted island.