Fisherman Zhao Changsheng goes out to sea and catches a giant clam, inside which are two injured baby dragons, one black and one white. He brings the young dragons home to care for them and names them Bai Li and Xuan Mo. A wealthy merchant, Cao Wanshan, wants to seize the Zhao family's gold mine beneath their well, so he orders Sun Dakui to force them to sell their house and even secretly attempts to kill them. The twin dragons transform into dragons twice to save lives, and in the end, the villains are brought to justice. The two dragons choose to stay, living together with Zhao Changsheng in a small seaside courtyard.