Sogang has an official Facebook group for 2020 exchange students. It's a private page so you'll have to request to join in order to be in the group. It's only for students who will be going to Sogang in Spring 2020 so if you've applied to Sogang, you'll have another page similar to mine. Since many exchange students are there for a semester or year, they'll have a new facebook page every semester.
We also have a group chat because one of the students posted if others would like to join a KakaoTalk chat (it's a common social networking app that is used in Korea) to get to know each other and many of us liked it. And now, there's about 150 of us are in the group chat. Not only we've got to know each other, but we also discussed about SIM cards, application for ARC (alien registration), coronavirus in South Korea, and so on. It's a really good opportunity to get to know each other before school starts and you're able learn more about the school.
If you're planning or interested in applying for Sogang university, I strongly recommend being involved in this group page. Sogang will send you the link once you get your acceptance package.