Hong Kong Cantopop boy band Mirror is navigating a challenging landscape after its meteoric rise to fame a few years ago, with its members now forced to compete with all types of online entertainment and the local showbiz scene grappling with broader headwinds, market observers have said. They also said that, despite immense public expectations, the band’s human vulnerabilities, paired with a local industry that distinctively lacks the rigorous pre-debut training like that of K-pop idols,...