Good afternoon Davina,
Thanks for getting in touch, whilst I am not aware of any future tours planned for South Korea, our product team always observe comments made on the community about new destinations travellers would like to visit so you may well see a tour to here in the future 🙂
That's great you are looking forward to your China tour, it's an amazing country with so much to see, you will have a fantastic time,
Kindest,
Ben