Is the King of K-Pop really in danger? Just a week ago, the internet was buzzing with heated debates over BTS's comeback. After their massive free concert at Gwanghwamun Square, critics pointed at the "lower-than-expected" attendance numbers and the sudden drop in HYBE's stock price, whispering that the BTS era might be fading.But today, BTS answered with cold, hard facts.According to Billboar..