I Am a Big Man on the Sea.

The protagonist traveled to the eve of the Battle of Chibi, decisively gave up the pursuit of the Central Plains, and secretly led his army southward. With the help of Wu Ju, the governor of Cangwu, he conquered Yizhou Island in the east and established a base there. He continued to conquer Ryukyu and Luzon Island in the east, the Sumatra Islands in the south, and the Indochina Peninsula in the north, establishing an unprecedented maritime hegemonic empire! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.