This drama with the catchy poster and synopsis was enough for me to go for it.
And it didn't disappoint me.
The mature plot of an affair which is pure.
The whole essence of this drama is in the fact that

People change, things revolve ultimately.
You don't hate, you forget and forgive.
You learn to live.

The 1st half of this drama has much more to offer with the character and plot development.
But the 2nd half loses that momentum completely with too many flashbacks.
Still, it's a great concept.

Kim Ha Neul 's choice of drama is often these difficult plots.
She wasn't at her best in this drama but still decent.

As for Lee Sang Yoon, his character was quite dull TBH.

The writer could've been much better at making expressive character but the focus was solely on them as a whole not as individuals which I think took turns to lose the edge.

The biggest thing you'll be baffled to find in this drama is that there's no forced hate.
People are quite understanding which is quite contrary to real life.