7.5/10 is my rating. This is a 2020 fantasy romance drama with 16, 70 minute episodes.

Lee Gon/Lee Ji-hun (Lee min-ho) is the King in a country called Corea that exists in a universe. parallel to the Republic of Korea. As an eight year old he witnessed the assassination of his father by his half uncle who also intended to kill Lee Gon. Jeong Tae-eul / Luna (Kim Go-eun) or her parallel counterpart saved Lee Gon from death and then disappeared. Since that time Emperror Lee Gon has been looking for his mysterious savior with the help of his friend and Captain of the Royal guard, Jo Yeong / Jo Eun-sup (Woo Do-hwa). Lee Gon’s uncle, Lee Lim / Lee Seong-jae (Lee Jung-Jin) killed the former king to obtain a flute that has magical powers including the ability to render the person who possesses it eternal. In fighting his Uncle, young Lee-Gon broke the flute in half with a sword and now has the other copy. Lee Lim opened the portal between the two universes and is reeking havoc along the way. Emperor Lee-Gon plans to put an end to his Uncle’s evil and close the portal between the two universes.

Spoiler***There was so much hype around this one in drama circles that I expected this to be one of the great ones. And, reading reviews, a lot of people really liked this but this is not my favorite role for Lee Min-Ho. I also did not see much chemistry between the two leads - they seemed more like two people that would be great friends. It was hard to see the transition from her more or less being annoyed with him to liking him then loving him. It may have been easier to see that transition if there was chemistry there but with the friend like aura I just wasn't getting it. Netflix also puts a particular spin on dramas that I am not as much a fan of - they Americanize things a bit and I actually started watching Asian dramas because I did not like a lot of what was going on in American dramas. What I mean by Americanize is there is this theme of over the top "strong, independent woman" who is just fine alone. I get that, I do, but I also think many people are overall happier when they are together with the right person.
Most single people I know and have observed are lonely on some level. I also could not get why he seemed so taken with her so quickly I know he thought she had some role in saving him when he was young but that wasn't enough to understand why he would be romantically interested in her. She was not very nice to him in the beginning so for someone with all the options he had to fall for her in particular, it was a hard leap to make. This was a parallel universe/time travel drama and I rarely find that premise compelling so it could be that I am a bit biased and have high expectations. I was often unsure which character from which parallel universe was speaking. That may have been partially my fault as I watched it very slowly as I was having a hard time staying interested. It moved back and forth and between a lot and was confusing at times. The ending where they travel every weekend together to different places and times and that is how they were together has to be one of my least favorite endings but is not uncommon with time travel. Not necessarily traveling together but it is common that they meet infrequently. I think, if anything, traveling every weekend to see the person you love would become tiresome. And you wonder about simple things like - what would they do if they had children. Would they become part of the every weekend travel?
There wasn't much to the plot either just his Uncle was a traitor who wanted to take over the throne and gain control of the magical flute for immortality. I would not re-watch this readily and would only recommend it to someone who is serious fans of either lead or who particularly like the time travel and/or parallel universe them.