It’s a big week for K-pop, as Korean boy band BTS debuts at No. 1 on the Billboard 200 chart with "Love Yourself: Tear" -- the first chart-topper for the K-pop genre.

Yet even Wings’ success paled in comparison to that of BTS’ follow-up EP, 2017’s Love Yourself: Her.Propelled by lead single “DNA,” their first song to debut on the Billboard Hot 100 at ...