Shares in BTS’ agency have plunged as much as 15 per cent after a heavily promoted comeback concert by the K-pop megastars in South Korea drew a smaller crowd than authorities initially expected.Hybe’s stock later recorded its biggest intraday decline since June 2022. The group’s event at Gwanghwamun Square in Seoul attracted 104,000 fans vs the 260,000 initially estimated by police, according to the Chosun Ilbo newspaper.Stringent crowd control measures, reflecting in part the authorities’...