When she returned to her apartment... (Spoiler alert)

Made me feel more for Bok-nam more then anything. For me, Hae-Won was unredeemable at that point for me, horrible selfish character. I think they were trying to redeem her with shopping the gangster to the cops but it didn't work for me, I can understand why the director and writer did it but she did far too many scummy things by that point and she killed off Bok-Nam that I just couldn't like her.

I think that was the point they were trying to make that it slams home to Hae-Won that she's forever going to be haunted for her actions and not helping her "Friend". Rightly so, she should suffer for what she did and didn't do. It's all about helping people when they are in need and she didn't help the person who cared about her the most.