The plot degrades very quickly. The dialogues are here and there, Especially Kim Sun Ah's dialogue.
It started well, had so much potential and then Kim Sun Ah's character had a drastic drop in quality.
Either she messed up her acting halfway through or more like her character went total rubbish.
I think it's the writer's fault. When you have created such good characters initially, what felt so short then?
They could've easily progressed much better.
The daughter's character is forced and irrational at times.
The best friend couple is too fake to watch,
And our protagonist is a guilt machine. I did this, I did that. Dude you did nothing, people commit wrong every day, just to attain happiness.

I had a particular interest in his ex-wife's character but her screentime was too short.
She acted phenomenally.
A decent watch. but I couldn't complete it.
Kam Woo-sung was exceptional as he's always.

3 stages of this drama Fantastic => Mediocre => Rubbish.