Love the story and how the writer tells em', as if it was a diary, yet it doesn't make it seem hasty.
The metaphor they use (the line on the sidewalk) is beautiful.
They're able to make the viewers relate to the story and able to play with the viewer emotion well, (i personally love eps. 3 & 4). They're able to make the viewer relate to the character and be mad, happy and sad for em'.
IDK HOW but it feels like they got a new ost for every eps.
The actors are able to express the character well, in their sad, happy or desperate emotion.