Lin Yu, a young man from modern times, accidentally travels through time and takes over the body of the legitimate son of a fallen aristocratic family in the capital, a spoiled young man. After the Lin family is framed, the entire household is exiled to a deserted island in the East Sea. With nowhere left to turn, he abandons his former reckless ways and uses modern knowledge to cultivate wasteland, expand territory, produce salt, and build cities. He brings together bandits, fishermen, underground clans, and tribes from the mountains and seas, then recruits a notorious pirate leader to establish a naval force and build a maritime stronghold in the East Sea. His rising power shakes the imperial court, prompting the emperor and powerful ministers to repeatedly suppress him. With strategists and military commanders at his side, Lin Yu navigates battles on land and sea as well as political schemes at court, gradually overturning every crisis. He clears his family's name, wins the hearts of the people across the seas, and remains together with his childhood sweetheart, Su Ningxiang. Ultimately, he establishes an East Sea empire powerful enough to rival imperial authority, laying the foundation for his ambition to claim the world.