Visiting Seoul, I would get alerts several times a day, written in Hangul. Seoul being close to the border with North-Korea, I first suspected that they were

Visiting Seoul, I would get alerts several times a day, written in Hangul. Seoul being close to the border with North-Korea, I first suspected that they were about missile tests. When I got an app to translate the messages, they were all about lost elders. Seoul is a city of 10 million people.