Cruz Beckham, the youngest son of David and Victoria, is trying to forge a path as the frontman in a rock band, and they started their first headline tour this week. What's more, they're not terrible.

Face scrunched up, she lets out a torrent of abuse: the kind that you would never hear in a Korean soap. But this is not the usual K-drama - this is a "micro-drama", the viral ultra-short format that ...