I think 30episodes is too little for this story cuz there are so many points that they don't explain us show us that make the drama so bad & confusing
There are many points that happens too fast and some events that I can understand.
I felt like Why??? there are many other ways but why???
To conclude , I felt like 30episodes is too little for this drama. I felt like I was watching the drama by skipping many necessary scenes.

And the ending.... I thought her teacher was dead by giving all his spiritual energy to the male lead but how he survived ??? So many questions left after watching it.

The thing that shock me is the fact that the actress is from modern world ,she is a traditional student & even her real name can only be found on the synopsis. Nothing was shown or even told in drama!!!

Another thing that annoy me was they change cloth at the critical time. For eg1... Female lead thought male lead was dead and she was mourning.The main point is at that time they were hiddening from the enemy in a cave and she changed clothes...
Eg 2.... Male lead is also injured and he was in hurry to save the female lead. When he arrived he was wearing the new dress ?

I think from the ending there maybe Season 2