More days than not, Korean-pop band BTS is trending worldwide. Their popularity extends from Seoul to Santiago, and we wanted to know why. This Quick Take explores the band's universal appeal, and what happens if mandatory military service in South Korea forces it to break up.In this episode:Michelle Cho, K-pop fan and scholar of South Korean film and media.For more:Three ways that BTS and its fans are redefining livenessConnect with The Take: Twitter (@ajthetake), Instagram (@ajthetake) and Facebook (@TheTakePod)