5-Point Short Review

+ Points
1. Interesting storyline
2. Focuses on side characters too
3. Gets time travel almost correct

- Points
4. Slight focus on romance
5. Bittersweet ending

Detailed Review
If you are like me who loves to watch time-travel stories, then this drama will keep you hooked. The ending scene can be difficult to wrap. A word of caution, the ending might slightly disappoint you.
If you are a novice to time-travel dramas, then this drama offers enough context to understand the story.
The story from the summary may seem to focus on the female lead and her relationships but that isn't so. This takes a broad approach with giving depth to every character; which is also the reason why there is hardly any romance. Sometimes, it may be difficult to keep going on as it focuses on other characters but in the end, it all makes sense.
The opening credits are spectacular and nicely edited.
The character of the female lead is very relate-able - talented but unsure, procrastinating and always in dilemma.
The casting of both the male leads is very perfect. The second male lead is just the perfect guy for the sapiosexuals.
Have a box of tissues with you, just in case. (Justifies the rewatch value)
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This is my first review.