This movie has rightly been compared to a greater movie, "Fight Club". It is more like that than it is like "The Karate Kid" to which it has also been compared. It is also a mystery of sorts. Jesse Eisenberg's character, Casey, works out a couple of mysteries as we discover what the "night class" is all about. Although the main surprises are guessable, there are so many surprises at the end that the audience probably won't see all of them coming. (I didn't.)
There also may be an implied mystery-solution that is never revealed. Let us just say that what happens between Casey and Sensei at the end of this movie probably recapitulates what happened between Sensei and his own master, but that is never made explicit.
There also may be an implied mystery-solution that is never revealed. Let us just say that what happens between Casey and Sensei at the end of this movie probably recapitulates what happened between Sensei and his own master, but that is never made explicit.