Dynamite and an ARMY: how K-pop’s BTS invaded the US billboard charts

• RM, V, J-Hope, Jungkook, Suga, Jin and Jimin belong to no ordinary boy band, but a multibillion-dollar enterprise making up a chunk of South Korea’s GDP
• While their success has only recently been recognised overseas, it has been a long-time coming and owes much to savvy marketing and fan engagement