Today is the fourth and final phase of school reopening for students in South Korea. It brings back into classrooms more than 1-point-3 million students in middle school first grade as well as those in the fifth and sixth grades of elementary school. As a result of COVID-19, they are going to school 99 days later than originally planned. With this,... all of South Korea's nearly six million students will be in class, instead of studying online at home. But most of them will only go on designated days,... with classrooms running at only two-thirds or even one-third of their full attendance to minimize the risk of infection.