I just finished watching this movie for the second time and it was wonderful. I felt kind of like I was a voyeur into their lives. I normally don't care for films that are dark in appearance, but I really appreciated how the cinematographer used a lot of dim lighting, as well as rain and overcast days throughout most of the movie, until after her surgery. I also really liked the close-up work on the actors' faces, it almost gave the feel that we were visually impaired and had to get close to see. At the beginning, I loved how the camera work showed the ML watching for the FL. No words, just us seeing what he was looking at, looking at the doorway, watching the driveway.

Acting/characterizations:
So Ji Sub as Jang Chul Min. I'm a big fan of this actor, and I thought he played this character very well. The darkness, sadness and loneliness of his life were almost palpable. It seemed like he was in sort of a self-imposed hell. When she came along, it was as if, first he didn't know what to make of her, and I felt that brief moment of him trying to decide whether to open up to the lightness of the FL. Chul Min was a troubled soul, but so caring. Once he committed to her, he was all in.
Han Hyo Joo as Ha Jung Hwa. She was terrific! I would imagine it would be very difficult to play a blind person, but she nailed it. Her character was so refreshing. Brilliant smiles, a happy and playful personality despite her difficulties. I really liked her speech pattern when she was getting to know him - she spoke quickly, almost shooting out questions abruptly. There was no artifice to her, you knew what she felt at every moment.

Chemistry:
Their chemistry was very sweet. They moved naturally from strangers to lovers. It was like they had been waiting for one another for their whole lives, and now that they'd found each other, they weren't wasting any time. We were on their journey with them, their voyage of discovery.

Fight scenes:
Well done, very hard to watch. Him getting pulled back into that life was sad, even if it was for a good reason. That said, him exercising shirtless was worth the price of admission! That man is ripped!

Ending:
Oh, my goodness, when they cross paths again, my heart broke for him. Him not talking so she wouldn't recognize him, he was back to his cold and lonely life, and it was painful to see him resigning himself to his old life. However, there is a happy ending, though it's too brief. I don't know why the endings of Korean dramas are so rushed.

Bottom line:
If I had to sum up this film in one word, I'd have to say "comforting".