This drama is not a cheerful one. It has a dark and depressing mood and a mature tone to it. This makes it different from mainstream dramas out there. It also explains the lower re-watch stores.

It follows the hardship of a few characters and how they keep going on and finding comfort and encouragement in each other. It's a beautiful story of an unorthodox friendship that is beautifully told. The actors did a great job and you really get to see a different side of IU.

The music is this drama is also well fitting and contributes to enhancing the experience.
Overall, a series worth the watch if you are looking for this genre of drama. If you prefer cheery uplifting dramas - stay away.