I think this kdrama is very suitable for marathoning, so much so that I finished it all in one day and enjoyed it. I think its length is sufficient, it didn't bore me nor did I think about fast forwarding through it, I think it had just enough of everything... except romance, although I guess I say that because I'm more used to this type of series containing more romance and that's why I expected more in the main characters. However, that doesn't detract from the plot of the series, the way the characters connected I thought was unique and certainly cute. Some people didn't like that the characters somehow didn't change that much over the course, but I think that's a pretty real thing, in the end our personalities are hard to change 180 degrees, but the characters did have a lot of growth and gained more wisdom about life, but they were still them at the end of the day, and that's fine from my perspective.
I want to highlight the cast, it was adequate and they executed it very well.

I would recommend this series without hesitation. I liked it.