south korea's very own law to prevent students from studying too hard. citizens can actually report misbehaving cram schools to the government for a cash reward. the tipsters have become known as the hagparazzi. we followed a team one night as they made their rounds in a district in seoul. there's a hagwon in this neighborhood on almost every corner. the team looked for suspiciously lit schools where students might be receiving an illicit algebra lesson. one school was opened. and the inspector issued a penalty. they've exposed 75 schools this year alone. sahlberg hopes south korea can reach a happy medium between its enthusiasm for education and its students' well-being.