A Bona Fide Killer

Yoo Bo-Na and Kwon Tae-Seong have been married for 5 years and they have a 4 year old daughter. Yoo Bo-Na is also a killer for a secret killers' organization and her job is to assassinate heinous criminals. She is renowned as a sniper and is known as Kingfisher. Yoo Bo-Na doesn't reveal her identity as a killer to anyone, even to her husband Kwon Tae-Seong. She pretends to work in an ordinary company to her family. After taking a 3 year maternity leave, Yoo Bo-Na returns to work as a killer. She now tries to juggle her dangerous job & her eventful family life. Meanwhile, Kwon Tae-Seong works as newspaper reporter. One day, he receives an order from his boss to cover a killer known as Kingfisher.