This isn't a typical "scriptwriter has it all laid out for you" type of drama. In fact, it's probably the most confusing drama I've ever seen. But it doesn't mean it's bad. In fact, the scriptwriter had her own logic regarding parallel universes and time travel, and it's our job to figure it out as the audience. So if you're into puzzle-solving and piecing things together, then this drama is for you!

The drama starts with bits and pieces of the two worlds, with an overwhelming number of characters (and their dopplegangers, which you may or may not recognize--). There's a lot of foreshadowing going on, as well as important details that will come in handy later on. Hence I suggest that while you're watching, you may want to subscribe to an analysis/explanation YouTuber or something (I had the benefit of being able to understand the Taiwanese YouTubers who did episode-by-episode analyses afterward. It helped me tremendously after ep 7 or 8).

Midway through the drama, things really start coming together and then the originally-slow storyline starts picking up. I think it took me til ep 9 or 10 to really appreciate the complexity and the plot development of this drama -- we follow Lee Gon on an unpredictable puzzle-solving journey to piece together how this world works and how he can save the world from being ruined by Lee Rim.

After finishing the last episode, I began my rewatch journey and suddenly *everything I saw in the first few episodes made sense.* After learning who's who, it's a lot easier to see the significance of every detail presented at the beginning and how everything fell into place at the end. Hence this isn't a one-watch drama -- it's something where after you go through it once to get the gist of it, you will want to go through again to pick up clues to the puzzle and interesting little details that didn't make sense without context.

The main love line didn't make sense to me (since I'm not a huge "destiny/fate" person and the character development wasn't that convincing). However, you will want to keep watching the show just to see how the other characters' relationships develop, and how Lee Gon strives to defeat the evil. There's so much going on with all the characters that having a faulty main lead romance won't kill the drama. Until the drama picked up, I totally watched it for Jo Yeong x Eun Seop. Favorite bromance. Amidst all the killing/deaths, the scriptwriter also did not forget to put appropriate comedic relief, so I found myself laughing a lot during the show.

Gotta commend the acting -- Woo Do hwan and Kim Go-eun especially, who had multiple characters to play. I really hope they win acting awards (and that Tae-ra is just a foreshadow of what will happen in real life next year ;)
The OST was also great. Not as great as Goblin, but I would put this on repeat.