ohhh do you have a link??
https://twitter.com/azjuns/status/1113393942517542913
That's what she posted about it on twitter.
She could be working on a new series right now and we just don't know it. Preparing for serialization can take a while and she also had to take care of the physical release. Most authors take at least a one year break between webtoons and those who publish without seasonal breaks often take longer.
However, if she still doesn't have a new series next year I'll be worried.
Juns still posts fanart of this series on Twitter & Facebook, but it's a damn shame she hasn't done any webtoon after this. On the plus side, Dark Heaven got a boxed set book release in South Korea.