Former police officer turned high school janitor. Haunted by the accidental death of a thug's brother, he secretly tracks an illegal martial arts ring run by Lee. He mentors Ken in self-defense, intervenes to stop the final fight, defeats Lee, and decides to return to the police force.
Billy is responsible for the thug's death, creating a foundational trauma that drives his resignation.
Lee seeks revenge for his brother's death, making him Billy's primary antagonist.
James is deployed to assassinate Billy, resulting in a violent street confrontation.
Billy trains Mike in self-defense, fostering a bond of mutual respect and loyalty.
Billy's mission indirectly safeguards Julie and other students from exploitation.
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