I love the Webtoon that this is based on and have been reading it for quite a while. I had known that there was a show based on it but was putting off watching it because my life was kind of crazy at that time. When I finally sat down to watch it, I was disappointed immediately. The female lead is super adorable, but the actor who plays Who Joon does not live up to my expectations. To be honest, I was expecting a super hot, charismatic hunk and this Who Joon just didn't give me that. Most of the side characters have annoying personalities and are kind of bad at acting (sorry!). The FL and Joon are too different from what they're supposed to be as per the webtoon, and Joon's basically bipolar in the show. There's too many cliche scenes, I'm not satisfied with their chemistry... I could go on and on. After the end of each episode, I would sit there and think, "What did I just watch?"
Don't watch it unless you're really into cheesy, half-put-together romantic stuff.