I think this drama is not waste of time but don't expect too much. I found it overrated because all of my friends told me lots of things how this show great is that's why I had high expectations. The script could be better, I feel like it was very messy and some coincidental things happened, these made the series unrealistic to me. I really like diversity of the cast tho they had touched nice topics.
I really liked this drama and gave 10/10. but episodes were too long and mostly I skipped parts :'D The chemistry between leads was amazing!! I really like ajummas and that 5 soldier. They were great TwT. In summary, the drama is definitely deserve to watch but don't binge it because episodes are really long and you can get bored.
I don't understand how people say this drama is slow?? Like every episode there is so many things happen and the suspense is amazing. I've just seen 5 ep but i really like this show
I watched it for Lee Jong Suk. The plot was very weak I'm sure even the writer said "what the hell are we doing" after some point. Characters were nice but the drama could have been better with this story line, obviously they fucked up.
This is the most adorable, great, wonderful drama I've ever seen. I laugh and cry. I feel sadness and happiness at the same time. I understand the characters very well because we all walked the same path we were young :') When I watching the drama I missed my high school year. I will never forget this drama.
I really like watching j-drama and i want to write review for some dramas. But English is not my native language so I can make a grammer mistake when I write something :'))
K-Drama 
overall it was a good drama but kinda meh 7/10
ps: dear Hyun Bin, you've got a new fan mwehehe
PS: I watched it on kissasian but translate is little rough so I hope someone translate better in the future..
NOTE: LIN YANG HAS THE CUTEST SMILE *^*