Zhu Heng, a 21st-century doctor with dual PhDs in marine engineering and history, unexpectedly travels back to the Yongle era of the Ming Dynasty. Relying solely on the modern knowledge stored in his mind, he overcomes seemingly impossible challenges and impresses Zheng He with his advanced understanding of navigation, earning an unprecedented appointment as chief strategist of the treasure fleet's voyages to the Western Seas. Using modern technology to gain an overwhelming advantage, he pacifies pirates, opens trade routes, and crushes Western colonial advance forces. Together with his beloved confidantes and sworn brothers, he sets out to make up for the historical regrets of the seven voyages to the Western Seas and usher in an age of Eastern maritime exploration, forging a mighty maritime empire for the Ming Dynasty.