I've been to korea on my own last year (April/May) for 2 weeks and this year (April/May) for 3 weeks. Next year, my parents wanted to visit korea as well and have me travel with them. I have a K-Eta that's valid till february 2027.
I didn't need one for my last 2 entries because my country was exempted (I'm german) but I liked the convenience to not need to submit an arrival card.
Will there be any questions asked if I want to enter a 3rd time with the same K-Eta within 3 years?