By Jae-Ha Kim When BTS debuted in 2013, no one expected much from the scrappy septet. They were a young group from a then-no-name music company that had yet to produce a superstar. If the hip-hop-heavy group was lucky, they’d maybe last a few years before splintering off in different directions. But that’s not how it turned out. Through blood, sweat, tears, and a strong sense of self and talent, BTS transcended the K-pop label to become one of the bestselling pop acts in the world. Full stop. In Bao Nguyen’s thoughtful documentary, BTS: The Return (premiering on Netflix on March 27), the filmmaker doesn’t present a sanitized version of the group’s story. Instead, viewers are privy to meetings with management, where the members’ artistry doesn’t always align with the business model’s bottom line. To everyone’s credit, these politely adversarial scenes between artists and management were left in the documentary for viewers to ponder. What if BTS had taken a different direction?…