Viki didn’t get the license for this drama until 2 years after release so it has been slow getting it translated, especially since it is available on other sites. It has only been translated to En for the first 8 episodes so with 50 episodes in total there is a lot that can be done. Viki has also provided the script so if there are people who like to just transcribe the Korean that would be great too while making it easier for some of the less experienced Ko-En translators.
Actually, the Korean subtitles are already up in ep 10. If you go into the video all the lines in Korean are already sorted out so it should be easier for you. I added you to the team so you can start any time you’re available ^^