The coronavirus forced 84-year-old Chung Seong-ran to do something new to celebrate South Korea's Thanksgiving holiday.This year, her daughter will not come to visit her during the holiday, which is called Chuseok.Instead, Chung sent a video message to her daughter for the first time in her life. A government worker helped her learn how."Please, always wear masks and be vigilant! Mommy is eating well and doing fine at home. I only worry about you. I love you," Chung said in the 15-second video.The Chuseok autumn holiday begins September 30. This year, many South Koreans are observing it differently than in past years.Usually, millions of people travel to visit their hometowns. But health officials have for weeks urged people not to travel during the three-day holiday.They say that increased movement could spread the virus and threaten South Korea's gains against COVID-19.A rise in cases in the Seoul area in mid-August and September forced officials to strengthen social distancing and other measures.