Yongary, Monster From The Deep (1967)

Starring Yeong-il Oh, Jeong-im Nam, Sun-jae Lee, Moon Kang, Kwang Ho Lee
Directed by Ki-duk Kim
(actor & director credits courtesy IMDB.com)

A giant monster emerges from underground to lay waste to Korea in its search for energy, but a young scientist may have the knowledge needed to defeat the creature.

This professional emulation of Japanese kaiju films by the Korean filmmakers is very well done, although the special effects are not quite of the quality of a studio like Toho at its finest.  Nevertheless, the characters are engaging and the film's on a par with many other kaiju productions, although it drags a little bit here and there.  There's more than a few similarities between Godzilla and Yongary, the giant reptilian monster here who has flaming breath and a giant horn upon its snout.  It's also interesting to view as a snapshot of the Korean culture and architecture of the time, although most of the buildings we see are miniature reproductions for the suit actor to smash.  It's definitely a worthwhile entertainment, especially for kaiju fans.