Story: I really liked how the story flowed, narrating the past then showing us glimpses of the present. I wish that the mangaka explained how Hae-rin got blind and what happened to the other characters after. The story keeps on talking about karma but I didn't see any karma happen to the main antagonist. Though there is nothing new and very k-dramaish. Character: I hate both the main characters. Hae-rin didn't really go through hell. She was just blind. She should have helped herself instead of always leaning on other people. She kept on about respect and pitying the handicaps but she herself is not helping herself. She doesnot work for her own nor help in the chores. When Joon-young was gone, she leaned on Ga-won. She doesn't have a backbone. She's so sucked into her sad sad life that she forgot that there are other people other than Joon-young.
Joon-young is also the same with Hae-rin. His life wasn't that sad and yet he is so bitter with his life. I think Hae-rin and Joon-young are bad for each other. Opposites attract and when you have both characters in a downward spiral. The story would also go downward spiral. But Joon-young did the right thing while Hae-rin only made it hard for all of them.

Feelings fluctuate and only in fiction will you find this kind of strong love. Love is unselfish, which is not true in the case of this manga.
I have yet to read a manga that has strong female characters.