The story follows a man named Lee Kang-to, a Korean police officer commissioned by the Japanese Police to betray his own country and aid the Japanese in the annihilation of the Korean rebellion. During his mission, he encounters a notorious masked man who dons a traditional Korean bridal mask to fight for Korea's independence by assassinating Japanese key officers. As the detective's hunt for "Gaksital" ("Bridal Mask") unravels, his eyes are slowly opened to the treacherous deeds he has committed towards his own countrymen.