Honestly, i started this drama because i'm a big fan of Seo Kang Joon (visuals), but after the first episode, i fell in love really quickly. The story, music, scenarios, the whole vibe of this drama is really nice if you like slow path dramas. I have to say that i'm a bit impatient but When The Weather Is Fine is worth the wait because everything is like an aesthetic tumblr gif (lmao).
I really liked Eun Seop, (one of the main leads that i liked the most in fact) he is definitely someone i would easily fall in love with in real life because i like calm and quiet man (:P).
About Haewon, i could really feel her pain at first. Imagine going through everything she went through. Being dissatisfied with your life is very common i imagine and it's something that i went through too (not being happy with what i was doing) and i wish i had a city like that to go and forget my problems (lmao).
But after all, i have to say that i didn't enjoy everything about this drama. In fact i didn't like the end at all. I couldn't understand some characters actions and i couldn't relate with some of them anymore. But don't let this keep you from watching! besides this, i really enjoyed this calm drama. I wouldn't watch again but i definily recommend!

English is not my first language so i'm sorry if you find any mistakes! also this is my first review.