The historic heart of South Korea's capital is bracing itself for what may well be the year's biggest event: the return of the world's most successful band in recent years, BTS. More than 250,000 people are expected to turn up on Saturday at Gwanghwamun Square, where the seven K-pop stars - RM, Jin, Suga, J-Hope, Jimin, V and Jung Kook - will perform together for the first time since October 2022. Most of them will watch the giant screens outside because only about 22,000 people who managed to