I have mixed feelings about this show. The story is one big mess and character motivations and actians dont make a lot of sense. When i finished it i looked at reviews cause i was curious and i found out the script was rewritten after first few episode so that explains my confusion. The thing is with this show is that characters act just unnaturaly they say weird stuff and everything just feels soooo fabricated. It drove me crazy i actually had hard time to keep watching. What kept me watching was i think actually FL. Most peolle say she was annoying and nosy but i find it cute and refreshing. What i was not finding cute was ML introvertness. Its ok to show how and outline how shy he is but dragging the show first six whole episodes where in every single one of them they are showing in your face how much he is introvert i was literaly screaming "take off the fucking hoodie you idiot" my main complaint is that there is so much scene that could have been soooo good and funny but screenwriterd just usually killed it by shoving in your face how your beloved ML is shy... snore. And im not even talking about the big plot and resolution with older sister that was actually literaly the stupidest and dumbest shit i have ever seen in any korean drama.
In the end it got better but still... this show just feels weird. The cast was great actors had chemistry but the writing was so soo bad

Edit:
I feel like this review sounded mean. This show is actually not that bad like i made it sound but more like only the story is just bad. There are some substories and scenes which were actually great and i once i burst out laughing which doesnt happen a lot. If the screenwriters showed us little bit less ML being yet again silent and if they just never came up with that old sisters story this show would be actually pretty good. Its the thing that the main plot stupidness just overshadows everything else so you overlook some very good scenes and themes.