The return of BTS is a big deal. In case you were in any doubt, just look at the frenzy surrounding the South Koreans' comeback. On Saturday, the band will kick off a sold-out, 82-date world tour with a free concert in Seoul,

Now the world's biggest boy band is set for a comeback concert on Saturday after a nearly four-year hiatus for the septet to complete military service -- and while the nation went through traumatic ti...