A 3.5-metre-long shark that wandered into a Busan waterfront channel has become an unlikely internet celebrity in South Korea, drawing nearly 20,000 spectators over the weekend as authorities opted to leave the animal alone rather than risk provoking it. The shark was first spotted on Friday in the waterway at North Port Waterfront Park, where it has remained for at least four consecutive days despite repeated efforts by the public to catch a glimpse of it. South Korea’s National Institute of...