I love both leads but oh dear what a waste! There was a palpable lack of chemistry between the two - despite both being so good in other dramas and capable of some really believable intimate scenes, these two just seemed awkward even when just hugging each other. Was it their 7 year age difference that made them uneasy with each other? Although their relationship started with one night stand there was no further obvious desire for each other - so we were left with the marriage/no marriage scenario. On his part I didn't quite get it- so he based this on his awful father? Because he was such a failure so he distrusted marriage or because he would be a burden? Well he was a burden already so what difference would marriage make?!
I just felt from the word go their relationship made no sense - particularly them getting together after their break ups of only 2 months? You don't get over a break up in such a short time - I guess this led to their difficulties as a couple as they had unresolved issues. However this just dragged without any really fun and believable scenes to give any depth to their relationship.
The second leads? They certainly had a character development arc - which lets face it they needed as they both cheated on their partners and therefore started pretty low. Theitrfast wedding led to the harsh realities of marriage. The 2ML I just didn't get- why was he so obsessed with her ex and his relationship with his ex? Comedy factor with him following them? Just seemed bizarre behaviour. Frankly I wasn't interested in their relationship or character development as they both cheated in the most awful way and for that I could not forgive them, despite even his developing awareness of how he acted so badly. I can't believe The Fl and him ever lasted 10 years with him being so immature and selfish - even if she also had faults in the relationship. Plus the way the exes turned to each other for advice? Please- too much too soon given how they cheated- just why would their exes want to give them relationship advice let aone her helping him write his column!!
The other couples - again immature men not communicating or facing their their responsibilities. How many dramas can withstand so many weak men?!!
The weather aspect was good - as an analogy to relationships and for its information on S Koreas climate and weather. But the meeting scenes dragged on and broke up the relationship stories.
I fast forwarded so many scenes as the series went on - a sure sign a drama is just not engaging me!
The ending? His father suddenly had a complete change of character due to his cancer diagnosis? Sorry just not believable. The fact it seemed like their was a wedding meeting between respective parents? Where did this suddenly come from? The couple just started their relationship again with the same lines from when they started- this sums up the weakness of how this couples relationship was dealt with - where was the sharing and connecting of minds, what did they love about each other, and what was that pathetic breakup all about? They didn't share their thoughts or feelings in any believable way.

I could go on venting my disappointment at the waste of two such good actors - lets hope they both get better roles and this doesn't tarnish their future. I'm finding it hard to see her in any future roles - she has become possibly a little too old to be in such immature relationship dramas with none of the depth of character of her previous roles.?