Nisa Mohd did not send her daughter to boarding school unprepared. Before the now 17-year-old left for Melaka, her mother enrolled her in silat, the Malay martial art, and made one instruction clear: report any trouble immediately.She still watches for shifts in her daughter’s mood each time they speak.Millions of parents across Malaysia recognise her vigilance, with the country still following the inquest into the death last year of 13-year-old Zara Qairina Mahathir and a steady succession of school bullying cases making monthly headlines.Into this climate arrived Netflix’s new hit Korean drama Teach You a Lesson, which does not sugarcoat the harsh reality of what some children endure.Kim Mu-yeol plays former special forces officer turned school enforcer in “Teach You a Lesson”. Photo: NetflixReleased on Netflix, the 10-episode series follows Na Hwa-jin – played by Kim Mu-yeol – a former special forces officer deployed by a fictional South Korean government bureau to schools where teachers have lost control and entitled parents have bent the rules.