The lives of three siblings are torn apart when two men kill their father during a smuggling scheme gone awry during the 1970s. The siblings – who then lose their mother in an accident – are raised separately, two of them ironically by their father’s killers. Lee Kang Mo is raised by Hwang Tae Seob and falls in love with his daughter, Hwang Jung Yeon. His older brother Lee Sung Mo is raised by Jo Pil Yeon, who eventually helps him get a job with the Korean Intelligence Agency, where he works. Younger sister Lee Mi Joo falls in love with Pil Yeon’s son, Jo Min Woo, but leaves him to pursue a singing career and eventually becomes a star. Using his resources at the KIA, Sung Mo finds his siblings, and together, they decide to investigate the death of their parents. And, they plan to exact revenge on the men and their families for ripping apart their own family. In their singular quest for redemption, will Kang Mo and his siblings risk losing each other as well?