Two brothers - Lee Kang-to and Lee Kang-san – live in Seoul in the 1930’s, oppressed under the Japanese rule. Kang-to, the younger brother, is a rising star in the police force and works with the Japanese police to capture “Bridal Mask,” a mysterious freedom fighter who fights for independence wearing a Korean Bridal Mask. Later when Lee Kang-to’s life is turned upside down, he dons the Bridal Mask and fights injustice and rights wrongs against the Japanese during one of the darkest periods of Korea’s history.

Kimura Shunji is a gentle Japanese teacher who has come to teach in Korea against his father's will. He is best friends with Kang-to and shares a loving relationship with his Korean nanny. He also falls in love with the fiercely patriotic Mok Dan, a woman who is in love with Kang-to, a twist that begins to change him into a darker person.