for me the value of a show comes from its entertainment level. as long as I feel satisfied when watching it, I'll score it well. this show is a very light romantic story. that means no deep thoughts, no deep script, no deep character development. so much it's frustrating sometimes. but it's light and refreshing. most of all, the relationship between the 2ML is very cute. really, the writer did a very good job on this. their first kiss is also now my favorite of all time!

which leads me to the cons: the story is too lightly explored to be catching. you'll find it easy to stop and you'll probably WANT to stop sometimes out of frustration or disappointment. just do it and come back when you miss it. it's also easy to dive back in. I managed to watch it in between other shows and that was the perfect match.
there is too much short cuts and some essential info about the plot are not even revealed. some characters just disappear without reason or explanation. this is very poorly finished. (details with spoilers in comments)

when to watch: if you have nothing else to watch, or if you are bored, this is a perfect romantic story to keep your mood light. keep it as a filler between the shows you are currently watching. have fun!