South Korea’s K-pop industry is booming, but investors in its stocks can easily get burned.

Thanks to now world-famous acts like BTS and Blackpink, the industry is worth about $5 billion, according to analysts, and is continuing to grow as more people around the world tune in. That’s pushed up the stocks of K-pop stars’ agencies and transformed moguls like Hybe Co.’s Bang Si-Hyuk into billionaires.