I first watched the Korean remake of JIN and found it enjoyable but now that I watched the original I understand why watchers mostly prefer the Japanese one. JIN is doing everything right and I hardly have anything to complain about, beside the fact that even though it has two seasons I want more.

The main storyline is easy to summarize but interesting with mystery and suspense which makes it a good watch. I kept watching and watching and forgetting time. You get a wonderful view into the Edo period and great setting. The costumes are beautiful and overall everything looks coherent. The story isn't finished with this first season so it's understandable why it ends open. It's an end that makes you curious for the next season.

The actors were all new to me, I haven't seen any of their other works yet. They immediately got me and I now have a few more favorites on my list. For me Osawa Takao stand out as he truly is JIN. I liked how much Jin fears about possibly changing the future with his actions while he's struggling with his ethics of being a doctor. This conflict is well portrayed and adds to the depth the drama has.
Saki is such a lovely character and I enjoyed the scenes with her. Ayase Haruka both perfectly captured Saki's innocence when she didn't know something and determination when it came to learning more about medicine.
The other characters and actors also left an impression and it was a joy to watch them.

In comparison to the Korean version where I mentioned that the music was sometimes out of place, the music of JIN always merged good with the scenes and is also recognizable. It's not a soundtrack I would listen to on its own but it completes the drama.

The rewatch value of this drama is high for me. I already caught myself rewatching particular scenes and ending up watching the whole episode cause I can't stop so it's definitely not the last time I watch it. It made it straight into my favorites list.

Overall I can only recommend this drama. It's a must watch for everyone who likes historical or medical dramas. Even if you're not into medical or historical drama it's worth a try. As for me I think this drama has this certain something that you can't name but feel it's there.