Shim Hakku loses his eyesight after his family was ruined by conspirators. Blind and poor Shim Hakku has to look after his daughter Chung. Shim Chung grows up to be a beautiful and strong girl. One day, she decides to sacrifice herself to the sea monster Indangsu and plunges into the sea to restore her father's eyesight. She has a narrow escape from death and returns to land after spending some time in the sea palace. Finally, she meets her father again and Chung's love for her father restores his eyesight.