I like Ji Jin Hee from the jewel of the palace (2003) and gave this a try.
This could have a more potential if this is a drama. The two episodes with the lucid dreams were a new concept, but the love between these two in the present life was really fast.

So the romance was lacking. If the ML and the FL had a kind of a long storyline than this, the plot would be better.
Maybe anybody would think the same. The moment he knew it was her and wants to be with her was so sudden even though they were lovers from the past. The tags were all good but holes in storyline.

This was a 2hr one but I watched with 1.5 speed at mostly.