Love Position: The Legend of Halley (1985)

Synopsis

An agent who was sent riding on Halley's comet to the earth. He was actually given an order to destroy the earth. Captivated by planet's beauty, however, he is no longer able to destroy the planet. Seventy-six years later, another agent from Halley's comet is sent to the earth to liquidate this traitor, who is now disguised as a girl named Lamina in Vietnam.