"Blind" is a interesting enough thriller, with an idea that is not used to its full potential and that loses too much time on non important things.
Min Soo-ah wants to become a policewoman, but one day, when taking his foster brother back home, they have an accident, he dies and she goes blind. Cue three years later and after a fight with her foster mother, she gets into a taxi to go home, with so bad luck that the driver is actually a serial killer. She doesn't know it, and before he can get her to his dungeon, they have an accident, the car hitting a woman. They fight, because she wants to call the police. Min Soo-ah leaves the car, the man takes the hit woman and puts her in the trunk, running away. The police puts a very bitter detective to help Min Soo-ah with finding the taxi driver, without knowing that he is also the women abductor they have been searching for a while.
So, "Blind" doesn't go very far away from your typical thriller, with the exception that the story is centered on a blind woman, more than on the detectives. Sadly, the movie doesn't offer anything different apart from that, so it isn't very original. On top of that, the bad guy (played with very little flair by Yang Yeong-jo) is just your typical serial killer. He gets women, he kills them. End. He is kind of immortal when the plot asks for it, and the police is kind of stupid in their work trying to stop him. Quite sloppy actually.
On top of that, "Blind" has some of the traits that all Korean thriller have. Violence is one, even though here we don't have much. A lot of swearing is another. And the cheesy moments too. HaNeul Kim is OK as the blind woman, but probably the one that steals the show is the dog, way more expressive than some of the actors.
If you like Korean thrillers, "Blind" is a good enough example, but it's not original and falls on the same trappings than other Korean movies. Probably some other movie ("Memories of Murder", "A Bittersweet Life", "A Dirty Carnival"...) would be a better option.