Four Iron Men (1977)

Ingeol and Ki-seong are masters of taekwondo and are bamboo shoots, but they parted ways to spread the traditional martial art, Taekwon, to the whole country. Upon arriving at Ganghwa Island, Ingeol discovers a group of suspicious people and tracks them. Meanwhile, Ki-seong, who had been traveling the country separately, heard the news and ran to Ganghwa Island, and together with In-geol's younger sister, Non-smoking, smacked the Ming merchants and Hyuk-soo gang to protect the gold.