During the Ching dynasty, the southeast coast of China was plagued with pirates, who not only plundered and set fire to ships, but also committed blackmail, extortion, and every other heinous crime known to mankind.
「誓報弟仇」則是清朝時候的故事。康熙年間，福建沿海一帶常有海盜出沒，不但掠奪船隻的財物、漁獲，且殺人放火、擄人勒索，無惡不作。