Correction: What do Koreans have to do with Ninja?

Ninja is a Japanese term for a killer or an assassin. The term seems to be a conceptual opposite word of the samurai, an honorary term. Teenage Mutant Ninja Turtles originated in a single issued comic by two young American artists in 1984. About ten years later after the self-published comic book got attentions from general public, a Korean film maker caught between two Koreas (released from North Korea but couldn't return to South Korea) came to US and produced three films, which I mistakenly assumed to be the origin of Ninja comics and films.


1. 3 Ninjas Knuckle Up (1995)
 
             
   
  2.  3 Ninjas Kick Back (1994)

             

3. Ninjas: High Noon at Mega Mountain (1998)

             

Wiki states that Sin Sang-ok, a legendary Korean film maker, produced those three films under the pseudonym, Simon Sheen.