both are about corruption, child exploitation, and pedophilia

Both movies share VERY similar plot lines. Both involve two boyhood friends. One grows up to become a cop, the other seems to have had an unknown fate. The cop investigates a series of serial killings throughout the movie and makes a startling discovery about the fate of his boyhood friend.

Both star Tsumabuki Satoshi
Both are crime/mystery genres

Both movies involve the abuse of vulnerable deaf children

Both 'Mountain Cry' and 'Blind Mountain' are about small-minded villagers in a remote chinese village.