Yen Sian-chun firmly believes in the legend that his ancestor buried plenty of treasure in the blue sea. So, he trains his twin sons to be treasure hunters from a young age. Their relationship gradually changes as they grow up, and they have great differences about the definition of "treasure."
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.