Handicapped female lead also being chased by a psychopath for witnessing a murder. The big difference is that the female lead actually has a brain and the rest of the characters (other than the villain of course) were also smart and likable.
Both are movies. Although these movies are nothing alike the dog (a retriever) in each movie provides emotional support to the lead character in their time of need (The loss of a parent & the loss of one's sight).
These dramas are very different overall. But both delve into the issues which blind individuals face, and also familial bonds and such. While Hyung is more of a story of acceptance, having hope and forgiving yourself, and moving on in life, Blind is a story of realisation, suspense and closure.