Some spoilers:











-Both are dark comedies about murder
-The main characters struggle with amnesia
-The psychopath killer mentors the main character to follow a life of crime
-The psychopath becomes obsessed with the main character
-The cops are a little too clueless of what is actually going on
-The main characters has an issue of killing due to their moralities.

*psychological thrillers with more plot-twists than an episode of Murder She Wrote
*both include the loss of children, and grieving parents.
*both tackle the injustices in the Japanese law system
I would include more, but that'll be too much spoilers. (I honestly think I probably spoiled enough) Both films are worth a watch!