Jiang Yu is just a odd-job worker making three hundred a day at the Jinjiang Center construction site, looking as ordinary as can be. Until, in a hoisting accident, he uses his astonishing engineering judgment to save Xu Qingyan, the president of Hongyuan Group, thus getting tangled in a series of conspiracies targeting the Jinjiang Center. Out-of-control tower cranes, financial blockades, the reopening of an old case—behind layer upon layer of crises, the Donglan accident from three years ago is gradually dragged into the light. Everyone thinks Jiang Yu is just a worker who knows a bit about engineering, until his true identity is exposed—the one who vanished for three years, the "Engineering Sage" capable of influencing the global engineering landscape, has returned.