Justin Bieber finds his documentary series “uncomfortable” to watch

Speaking about one episode in which Justin, 25, details his past drug use and health struggles, Michael explained: "Once we watched episode five together and he was just staring at it and he said, 'This is tough ... There's power in weakness.’ I thought when he said that, he said, 'The very reason why it's sometimes uncomfortable for me to watch, that is the reason I want it out there.’ ”

Michael and Justin watched all the episodes together before they were finalised, and the director says they had "deep conversations about why things were a certain way” during the viewing process.

The filmmaker noted that Justin became “emotional” during certain moments, and claims he “certainly broke down” on more than one occasion.

He added: "It was never a place of subjectivity or trying to make a Justin Bieber commercial. He was never trying to use this as a vehicle to push album sales. It was really about how to tell [his] story."

Michael also spoke about his hopes for the documentary, as he said he wants the series to tell the story of Justin as a “human being”, rather than a superstar.

Speaking to ‘Entertainment Tonight’, he said: "He is the first global superstar, megastar of the social media era, and that has ramifications and consequences. I think he's doing a pretty good job. I think what makes him a global superstar is that talent. Paired with crazy ambition and work ethic. He just does it over and over again. And I'm watching this and I was just like, 'Wow. He's grown up and he's amazing.’ ”