Jang Young-Sil (Gang Ye-Won) barely lands a job at the NSA (National Security Agency). She is hired as a contract worker to write positive comments for the NSA. Na Jung-An (Han Chae-Ah) is a detective who often uses foul language. They carry out an infiltration operation to recover money that was stolen from her boss in a voice phishing scheme.

Based on the hit manhwa series of the same name, Bridal Mask brings viewers to 1930s Korea during the height of Japanese imperialism. Lee Kang To (Joo Won of Baker King Kim Tak Goo) is an ambitious and callous Korean officer employed by the Japanese colonists. Despite his mother's disapproval of his work and his own brother's antagonistic history with the Japanese, Kang To continues to play by the colonist's rules in hopes of becoming successful and bringing his family out of poverty. However, a mysterious figure wearing a traditional Bridal Mask always seems to get in Kang To's way. The Bridal Mask appears as a Zorro-like figure who protects the people from the Japanese colonists' oppression and abuse of power. An unexpected turn events brings Kang To to cross paths with the mysterious Bridal Mask, changing his future and the nation's history forever. Written by MDL