Hey! I don't know if you already do this but I'd sit with the students in like a semi circle (and following covid guidelines ofc^^).
For a small class like that, this is a great time to get to know the students, learn their names, their interests and if you are learning korean or know some already, I'd definitely try using it just because students tend to enjoy hearing foreigners speak in their language/it can be fun for them to teach you words n stuff.
If I were you, I'd focus less on actual teaching material and just having fun and building relationships and using English here and there! Of course, cover what needs to be covered. But from my experience, students reactions/attitudes depend greatly on the relationship they have with their teacher. Interesting games can of course enhance that.
Some simple games like pictionary, hangman (words or even phrases later on!) or Korean games where you have to make 5 in a row (this is a 2 person game but you can have it where it's the teacher vs students too or just pair them up) is doable for a small group.
Good luck and hang in there (힘내!)