Modern oceanography doctor Shen Tinglan transmigrates into the sickly and frail eldest daughter of the Ministry of Works mansion who was convicted and exiled, getting banished to the desolate Qiong Island. She voluntarily chooses the down-and-out military household member Xie Chenzhou as her husband. Using the Sea God Illustrated Guide to communicate with marine life and catch rare seafood, she leads the military household to shake off poverty, build ships, and form a naval force. Together, the two break down merchant monopolies and pirate conspiracies, guarding the island while also finding love amidst adversity.