giraffe님 하하 That's one of Korean traditioal gifts like a box of pears and apples.
You have known Korean well.
But we usually give that gift on New Years Day, Chuseok, and a BIG holiday.
What about a cake?
I used to bring a cake when I had the same situation.
And usually we have a cake together after a meal.
I suggest you "고구마 케익"( sweet potato cake). Both old and young people love this cake. A cake is not that big gift and we can have it for dessert together.( A host don't need to care for dessert, as well.)