Writing this review after having posted many comments on this as i binged on this for 2 days. I kept off this as it aired for 2 reasons -1 )Didnt want to wait as it aired and 2) It was getting terrible comments as it progressed
The rating has reached 7.6 as of writing this review and it may dip further as this show seems a target of MDL commenters lately for negative comments.

Coming back, I found this incredibly entertaining,fast paced,emotional and topical hopeful drama.It deals with costs that come with time travel and is hence quite different than many fantasy dramas that promote this concept. Every episode starts with a quote on time and its importance for lives..

Am a fan of Joo Won esp in intense roles and his turn as Lieutenant Park was like a superb fit..As the show progresses you feel for him a lot..One of the most memorable Kdrama ML characters now for me.
Kim Hee sun ,esp the mom aced this one.I dont remember any other Kdrama showing a mother son bond so beautifully.She basically sacrificed her entire life for her son,had an utterly tough existence and the end she kept getting repeatedly was so unfair.. As Tae Yi,she was a diff character but her fondness for the Lieutenant was beautifully shown..Many people are disgusted with this Otp (Both Mom and Tae Yi have identical faces) but they are fine as per me..She is NOT his mom,period.
Kwak Si Yang as Min Hyeok was another tragic character and while he didnt get the end i felt he should have ,he was superb throughout
All other supporting characters were awesome..
Melodious OSTs,BGM, beautiful cinematography,production are all pluses for this drama.
The PD and writer really made a beautiful show..The ending has plotholes ,but is very serviceable..I was just happy to see Joo Won living a good life and with a hopeful romance to follow..
Maybe the MDL raters would rate this better if it ended with a sad ending ..I love happy endings though.