Algernon ni Hanataba wo (2002)

Both movies are the same story; a learning disabled man faces some prejudice from his co-workers and mother. He is then given the opportunity to become smarter through an operation.
Algernon Ni Hanataba O has more of a romantic focus, and the main character's transformation from dumb to smart is much more dramatic, while Algernon Ni Hanatabo Wo spends more time showing the main character's struggle while he is learning disabled.

Hello, God is the korean adaption of Algernon Ni Hanataba Wo. In both movies, a learning disabled man is given the opportunity to become smart via modern technology.

They both focus on an intellectually disabled man who is abandoned by his family and sent to work with people who mistreat him.