Firstly, if you're looking for a review without any comparisons because, just like me, you found this drama by itself, be my guest.
As a person who did not watch the original, I really wish we could just appreciate this on its own, instead of pointing out every single thing that tells both dramas apart – even if they are good or bad.
I started watching this, not even knowing it was a remake, and found it astonishing. The whole plot really gives you some food for thought, it's truly a well-told story. It checks every box in what I personally find in a good drama: romance, thriller and mental health issues (yes). The ending is just perfect in my eyes, makes the entire show worth it.
For the OST, the songs were charming and, unlike many people I have seen here, the main song perfectly fitted the emotion that this drama was supposed to give – a certain nostalgia and desperation.
Another thing I would like to talk about is how much Jeon Yeobeen shined as Kwon Minju, I was in complete awe all the time. However, I must complain, there is a lack of women in this story, which makes her the only remarkable female in the entire show.
This show really left a strong impression on me, so I think I will keep on thinking about it for a few days and remember it for a long time. It's simply that beautiful and intriguing, it truly touched my heart.

PS: this is my first review + english is not my first language so I gave my best