Legend has it that more than 300 years ago, the legendary pirate captain Yen Si-qi buried a large amount of treasure in the blue sea. Yen's descendant, Yen Sian-chun, firmly believes in the legend and yearns to prove the history. So, he trains his twin sons, Dong-jing and Bei-wei, to be treasure hunters since they're young. The father and sons, who used to have a great relationship, gradually change as they grow up and have great differences about the definition of "treasure." Things take a turn for the worse when Dong-jing leaves home in anger after an accident.
