This is highly underrated. The writing for this is very strong so far. The whole fantasy + sageuk combination is done well. The story and mystery keeps you hooked. This should be rated at least 8.3
The FL had a tough love life. But, I find her non-love life very dream-like. She lives in a wonderful countryside home and gets to work with co-workers who like her. She also loves the work she does.
The ending might seem abrupt to some but the point was that the ML was toxic. He was pretty immature and hurt Seol Ha repeatedly. By the end, Seol Ha got tired of his antics and fell out of love. It was realistic but I think the director made the ML too unlikeable.
To be honest, the reveal surprised me a lot. I expected Baek Ho to fire her in the past. But, him being part of such an immoral conspiracy almost feels out of character. The ML has been shown to be practical and cold but he has been shown to at least have some principles.