SEOUL, South Korea -- An Apple TV+ documentary series, “K-pop Idols,” premiering Friday, offers an intimate look at how the K-pop industry is embracing diversity while grappling with challenges in a field that demands perfection. The six-part series features Korean American star Jessi and up-and-coming K-pop bands like Cravity and Blackswan, documenting the highs and lows of their careers. K-pop is known for its blend of vocals with precise choreography.

Blackswan members Fatou and Nvee told The Associated Press they practice up to 10 hours daily, including choreography and vocal sessions before the “comeback” season which refers to a string of events to promote their latest songs. The grueling practice starts early. Once under contract, K-pop trainees enter a system that includes classes in manners, language, dance, and choreography.

As of 2022, there were 752 K-pop trainees under entertainment labels, according to a Korea Creative Content Agency report . Despite recent pushback against the perennial “dark side of K-pop” narrative, the documentary shows that some industry problems persist. Former Blackswan member Youngheun said members had a curfew and were not allowed to drink or date.

“We even had to report when we were getting our nails done and going to the convenience store in front of our house,” she shared in the documentary. Rigid control extends to diet. Blackswan member Gabi is seen eating a meal of egg, chicken breast and what resembles sweet potat.