Both are BL films about the difficulties that follow a romance between a male prostitute and a closeted gay man.

Both movies are about the first emperor of a unified China, king of Qin. While they have different focuses story wise, they both show his personal and political struggles, etc.

Both movies tell a hopeless love story between a woman and a convict.

Both films detail a young girl who is kidnapped, held captive, and subjected to torture by a single man.

Both films are about the first Emperor of China's Qin Dynasty.

In both films, a terminally ill parent tries to teach his/her intellectually disabled son everything he needs to survive before he/she passes away.

The only theme these two movies share is an innocent man who is tortured into giving a false confession. National Security spends most of the movie showing us the actual process of torture while Box: The Hakamada Case focuses more on showing us the ramifications of such unethical interrogation methods. Both are based on a true story.

Both films portray corrupt police forcing a confession from an innocent man who then spends years in prison. Both are based on a true story.

Both films take place in a mental hospital and show the strong friendships that are formed amongst patients.

Both are old school Japanese dramas that tell the story of a learning disabled man who faces discrimination.

Both dramas focus on the difficulties an intellectually disabled young man must face when abandoned by his family. Algernon Ni Hanataba O focuses more on romance and teaching life lessons to its characters, while Seija No Koushin is much more gritty in its portrayal of society's discrimination against disabled people.

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