After first couple episodes (which were very slow) I thought this is going to be drama revolving around struggles (over)sensitive people have living in such loud world. And, since it was male lead who was sensitive, not typically FL, I was more interested to see how drama will explore his world and how he will "adapt" once he falls for FL. Unfortunately, they shifted focus on FL, her struggles and it became just one more drama with "ML is there for FL" and "wow, he is such a sweet guy".
Do I regret watching it? No, I don't. Would I watch it if I knew half way writers will forget about his sensitivity and turn it into simple plot device? No, I wouldn't.
It is sweet drama about family and friendship and people should try it, with or without FF button.