Plot:
At first I was liking it a lot, it seems like it would be a nice story about friendship, romance and self-improvement... But when it was known what happened years ago between Tae Yang and Jun Young it felt so dramatic, everyone started acting like they had 15 years??? When they were supposed to be 25 years old, that was annoying.
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Couples / Chemistry:
I'm not going to lie, the two couples had excellent chemistry.

The second couple deserved more time screen, was the best thing that could happen in this drama, from their chemistry, how their story unfolded, their cute moments, and how they overcame everything and managed to be happy.

The main couple had chemistry and it was nice to see how ML always supported and was there for FL but there came a point where it was stressful, her crying, him consoling her and that vicious circle LIKE STOP
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Acting:
Okay, I'm not really complaining about the acting, Ju hyun and Jong Hyeop really made me cry in their emotional scenes and as dramatic as the central problem of the plot was, you could feel their pain and want everything to be fixed at once.
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Ost:
It seems like meh dramas have the best ost, I'm a fan of the intro song >>>