Lemme start by saying this is one of the best Kdrama I watched in 2023 by far.
It may not have the ending that most people want but I'll say its satisfactory.

The story was so engaging and interesting, it was filmed the way that we got sucked into the history of the main couple through dream. I guess the bits n pieces of the scenes the drama showed was very good and each dream continued on from the previous that we got to see the whole history itself towards the end.
I dunno how the webtoon unfold but the drama did grow on me a lot that I can't stop watching it.
Its good that they stopped at episodes 14 as any further would make it way too draggy.

Lets talk about the casts... They were all AMAZING. To the point that I started to hate the 2 villains (the historical father and the future one being possessed with).

I think Kim Young Dae (KYD) grew a lot throughout his acting. I've been watching him since he was in Penthouse and his growth and diversity amaze me. His portrayal on both characters (Jun-Oh and Do-Ha) (JO & DH) was very well implemented. I can tell which character he portrayed by just his gaze and voice (intense gaze and darker voice for DH) respectively. Also, the language they used in this drama (DH from historical era whilst JO from modern era).
I know there are people who still think he is not good enough but for me, he is damn good. (I love his acting in shooting star the best haha).
Hope to see him in a more diverse acting in his future project.

As for Pyo Ye Jin (PYJ) she grew from playing side roles to main one and she nailed it here. The way she portrayed Yong Hwa (YH) and Ri Ta (RT) character were very good. When she is acting as YH she has that cheerful and positive vibes and her voice was cheerful and a bit high. Whilst portraying RT character her voice as deeper and has that intense gaze and demeanor (as she need to take revenge and all). Would love to see her in more diverse role for her future drama. I sure become her fan through this drama.

As for the rest of the side characters and the second couple, they all nailed their part well. Especially the villains (I'm sorry I just hate seeing those 2 actor playing villains roles most times and my hatred grew even more in this drama, it showed how good they were being a villain. HAHA)
The producer did well in casting all the actors in this drama.

The ending was however satisfactory. I knew the main couple (DH & YH) will not have a happy ending but I was hoping they would though. But seeing the ending I think it was justified as they kept saying throughout the drama that they were not meant to be together in this life but were together to break the curse they were in for over 1500 years. But fate did bring them together again in I assume like 50 years later... overall viewers were given the hope that they will eventually together again.

I love how the writers did give some essence of DH in JO after the later woke up from his so called coma and finished his cancer treatment. (The way he spoke and a press con for his delayed movie). "People say disappointment in love makes one stronger. We're here today to cheer each other. I believe words of blessings will be more helpful than cursing, right?" as he said this, I really thought DH came back but then his goofy expression came back (tats JO character). But the way he said it and his demeanor really make me believe it was DH.

Overall it was a great drama with great CGI and story and casts.
I am quite satisfied with the ending and also do fit the whole story.

Again this is my opinion but putting asides other opinions do give this drama a try. It was good and engaging enough for viewer to anticipate the next episode.
Hope you'll enjoy this drama as much as I do. Happy watching ^^