Pearl diver Su Lei's parents were murdered ten years ago by his paternal cousin, Su Zhenhai. Since then, he and his younger sister, Su Wan, who suffers from heart disease, have struggled to survive under the oppression of their clan. During a deep-sea pearl-diving expedition, Su Lei unexpectedly discovers a priceless Dragon-Scale Blood Pearl, changing his fate forever. With the help of jewelry appraiser Shen Qingyan and veteran boatman Old Zhou, Su Lei establishes a deep-sea pearl company while secretly investigating his parents' deaths. He repeatedly thwarts the persecution orchestrated by Su Zhenhai and his son, exposing their crimes, including the murder of his own elder brother and the falsification of maritime territorial rights. He ultimately brings everyone involved to justice. In the end, Su Lei reforms the pearl-diving system, preserves traditional techniques and applies for their recognition as intangible cultural heritage. He also reunites with an overseas branch of the Su family, takes his brand international, and finds lasting love with Shen Qingyan.