This series has one of the most interesting storylines ever. I noticed that most of my top-rated dramas are related to time (present-to-past). The intriguing factor in this series that paid my attention is that how the time looping develops the relationship of the characters. Only one thing that pissed me off in this is the final plots in Episode 13 are somehow rushed.

Emergency room setting is very fantastic. The actors made a proficient portrayal in the medicine practice. Everything is great but never the gun/kidnap scenes. Everyone looks lousy when it is supposed to be nerve-wracking.

I haven't noticed the music they used. Maybe, there's none at all?

Must-watch! Highly recommendable! This series is full of funny moments, joy, sadness, annoyance to the antagonists, and most of all, love.

(Overall suggested rating is 8/10 but I will rate this with 9/10 because it deserves to be in my top-tier dramas)