A simple children’s tune has grown into one of the world’s most recognisable digital brands — and a multimillion-dollar company. South Korea’s Pinkfong, the creator behind the viral hit Baby Shark, ...

When Kim Min-seok gave the go-ahead in June 2016 to publish a 90-second clip of a children's song, he had no idea what he was unleashing. It became a global phenomenon, clocking up more than 16 ...