I really recommend this drama. At first, it really seems like it will be a normal slice of life drama but the plot involves a lot of really serious themes too. I really enjoyed how this drama talked about various subjects but without necessarily resolving the problems of the characters. The 1st season was really enjoyable but I preferred the 2nd season, especially because of Ji-won. Some things that we learn about her in the 1st season became really important for her plot in the 2nd season and it was done really nicely.
Be careful to watch the episodes until the end! There's usually a scene after the teaser for the next episode and it allows the viewers to have more details about the characters' personalities.

I really hope there will be a 3rd season because there's a lot of things unresolved, and a mysterious scene during one of the last episode. But the strength of this drama is also that they know how to let some problems and situations unresolved without it looking like bad writing or a mistake; it's just part of everyone's life.