I'll start with the positive points:
First of all, the story is really original and the addressed problematics are intelligent and realistic.
The actors' performances are breathtaking (especially Earth and Fluke one's but they all are good!) and I cried a lot because of how good they were.
The relationships are healthy and cute and they all have a good chemistry with their partners.

Now the few negative points:
It's a serious drama so be ready to cry (even if it also can be a good point)
It can be a bit long for some people at the last episodes because of that
WinTeam doesn't have much screen time and their relation is a bit too fast for us to follow wich is too bad because they are really cute( luckily they will have their own drama :3).