Yoo Bo Na appears to be an ordinary working mother in her 30s, juggling family life with her husband and daughter. But behind her everyday facade, she is "Kingfisher," a legendary sniper who hunts down ruthless criminals that have escaped the law. After returning from a three-year childcare leave, Bo Na resumes her dangerous double life, struggling to balance motherhood, marriage, and her deadly mission. As her investigative journalist husband Kwon Tae Seong unknowingly inches closer to discovering Kingfisher's true identity, and determined detective Lee Dong Jin relentlessly pursues the elusive vigilante, Bo Na finds herself trapped between family, justice, and survival. With the help of her loyal ally Kim Bong Pal, she must navigate a world where one mistake could destroy both her secret life and the family she cherishes.
