There was a scene where KoMunYoung was persuaded many times to value the final moments she may have with her estranged father.
The doctor diagnosed that he hasn't got much time left, but KoMunYoung was adamant not to meet him.
In the past, I used to interpret scenes like these that the protagonist is "resentful, unforgiving, still holding on to anger, hate" and all those simplistic, compartmentalizing, mainstream emotional words.
But having gone through so much.
I understand better now.
Sometimes people don't retrace their steps, or even just to turn their head around to look back, maybe simply due to fear and nothing else.

Fear of what they may feel, 

fear of how the provoked feelings can affect them and etc...

Having survived the past, not many dare to return to turn the same dark pages of the chapter again.
It's self-preservation
It's survival instincts.