I am going to divide the review in parts for ease of reading:
**TIME TRAVEL** - The major element of the drama is time travel, the drama handled it pretty well despite it being a complicated storyline, at the end of the drama I still have questions about it but they don't affect the outcome in any way. Everything made sense at the end.

**SUSPENSE/MYSTERY** - This is my favorite element of the drama, with each and every episode, the end kept me in suspense and the reveal of the murderer was rather unexpected, not gonna spoil though ;)
If you love suspense dramas, this is a must watch for sure!

**RELATIONSHIPS/ROMANCE** - The romance between ML and FL is very subtle and slow-burn romance. There are other couple in the drama though, the young versions of FL's parents have very cute interactions between them. I also loved the bickering of FL and younger version of FL's father. Coming to other bonds in the drama, some are heart felting and some are toxic. It has a very well rounded emotion to it.

My rewatch value for it is low as its a mystery drama, and the suspense is no longer suspense after you complete watching the drama.
Fl's acting was a bit awkward for me but overall the cast. The music, and the story were perfect.
This is my first time writing a review for a drama, and that should tell you how good this drama is :)
If you about to watch it then All the best and Happy watching!