Why do Yangko pirates hate Wu Gankun and Zhao Hongsheng?

Yang Donghai 1936. The wandering sea cat, begging and fortune telling, was wrongly tied to Julong Island with his child Wu Ruoyun. _ _ years ago, the parents of the pirate leader _ shark were killed by Ruoyun's father, Wu Gankun, and now he wants revenge. Sea cat _ Ecstasy charmed the guards and fled with Wu Ruoyun all night. On the way, they happened to meet Wang Tiankai, an injured underground party member who was chased by the security team. The sea cat carried Wang Tiankai into the abyss, begging for food and Chinese herbal medicine, and saved him. The Wu family and Zhao family in Hutouwan town are enemies, and they can't tolerate the struggle for the right to go to sea by the Yangko team for many years.