Consumers of K-pop and arthouse Korean films have a definite divide, but now that boundary is blurring as well-known K-pop stars are showing up in arthouse titles and social dramas with a message.

They are after big, bruising fish. And no way of catching is more fun than getting them to attack a topwater lure, known as a popper, in a fearsome boil. Such blow-ups by 40-pound fish can make short ...