So this review is based on someone who hasn't seen the original. I heard it was a remake but I never watched the original so I won't be comparing anything.
As a standalone, I thought the story overall was very well done - It keeps you on your toes kinda wondering where its gonna go and what happened to Koo Yeon Jun, while at the same time slowly unraveling the mystery of Min joo. Even with the time travel aspects, I felt they did a great job wrapping up the ending as well. We see a very powerful theme of mental health with Min Joo's character, while the theme of destiny and fate is heavily portrayed in the leads. For me the pacing was great, every time a loose end was wrapped up, there was another that would begin to be worked on so it kept me waiting and enjoying the happy moments inbetween.

The story was the biggest selling point for me - the actors did a great job although if I were to criticize anything, it would probably be the FL for 2 or 3 scenes. Primarily, the first time Jun hee sees "Jeon Jun" again - I felt the impact of the scene wasn't as strong as it could have been.

The romance wasn't as strong as many other dramas, but the green flag ML moments were there and they were very sweet! His character may seem a bit clingy at the start, but as the drama goes on, you understand what he was protecting and why he valued her so much.

Music was very memorable and all the characters do leaving a lasting impression so overall a very pleasant watch! Would 100% recommend to someone who enjoys a little murder mystery and happy throwbacks.