Beijing corporate worker Zhao Fan, unable to bear workplace pressure, resigns and returns to his hometown. He accidentally activates the Fish Contract System, gaining the physique of a special forces king and extraordinary abilities to control marine life. He contracts dolphins and killer whales to form an ocean hunting elite team, with fish hauls overflowing every single time, rising from a poor fellow oppressed by the Wang family into the hundreds-of-millions-worth "Zhenhai King". He leads his entire family out of poverty to prosperity, helps his elder brother settle his marriage, falls in love and marries wealthy socialite Chen Xiaoxiao, builds a fleet and makes a group of brothers, ventures into the deep sea experiencing adventures such as outwitting enemies, marine clashes, and shipwreck treasure hunting, and finally achieves success and retires, returning to home to accompany his wife and daughter.