This work tells the story of an outstanding female high school student with all-round development of morality, intelligence, physical fitness, art and labor-Lan Hua, after many tests, obtained the qualification examination certification of the treasure hunting expert, and joined the team of submarine salvage to rescue the lost civilization of mankind. But as a high school student, no matter how smart she is, she can't cross the age gap, and she encounters all kinds of problems in practice. WHEN LAN HUA WENT TO THE SOUTH CHINA SEA TO SALVAGE THE HOME, SHE CLASHED WITH A CERTAIN FEMALE HIGH SCHOOL STUDENT CORPS AND MET A MYSTERIOUS GIRL NAMED KAREN. The growing Lanhua is facing a new challenge in her life.