Kang Hyo-won is not a marquee name in the music industry. The South Korean producer is better known as Pdogg, the studio wizard behind hits by K-pop supergroup BTS and other acts on the roster of Korean entertainment company HYBE. Because Kang played a key role in HYBE’s global success, his employer gave him 128,000 stock options in 2016 that turned into about $35 million when Kang exercised them. (All currency conversions to U.S. dollars in this story are based on the average 2021 exchange rate.) That made Kang the second-highest-paid music industry executive last year among those whose earnings are publicly disclosed. Yoon Seok-jun (aka Lenzo Yoon) and Kim Shin-gyu, co-CEO of HYBE America and chief artist management officer, respectively, also benefited from HYBE going public. Yoon nette...