Ji Han-jae is a South Korean hapkido grandmaster known as the founder of Sin Moo Hapkido. He appeared in the 1972 film Game of Death starring Bruce Lee.

Hapkido is a Korean martial art. It is a form of self-defense that employs joint locks, grappling, throwing techniques, kicks, punches, and other striking attacks. It also teaches the use of traditional weapons, including knife, sword, rope, nunchaku, cane, short stick, and middle-length staff, gun, and bō (Japanese), which vary in emphasis depending on the particular tradition examined.