Kwon Do-hun is an expert sniper and a secret agent working for the National Intelligence Service. To conceal his true identity, he lives a double...

Kwon Do-hun is an affectionate husband and father, but he is always late or absent at every family event because of his overwhelming work. After...

Even after meeting Chief Oh, Yu-ra can hardly discard her suspicions. Meanwhile, Do-hun prepares an event at a luxury hotel for his wife.

Yu-ra and Chief Oh encounter again at the hotel suite Do-hun booked. Do-hun attends his daughter's school play and meets his friend, Thomas Wolfe.

Do-hun learns the truth while searching for the sniper who injured his colleague during a mission. Wolfe becomes the target of another sniper.

Chief Oh notices the gunshot wound on Wolfe and recalls someone. Yu-ra gets a call and hears a voice she had long forgotten.

Do-hun is troubled after getting unexpected information about Chief Oh. Yu-ra comes face-to-face with the mysterious caller.

Jo Tae-gu knows about Yu-ra's past, and his subtle threats make her anxious. Do-hun and Chief Oh try to read each other while hiding their true...

Tae-gu consents to leave Korea on one condition. Do-hun finds a picture while tracking down Chief Oh and gets assigned to a sniping mission.

The NIS senior/director calls Do-hun and asks if he found the sniper that killed Butterfly and where that bullet hit her. Director expresses his...

The childhood history of Yu-ra and Tae-gu.

The story when Do-hun first met Yu-ra.

An intruder breaking into Chief Oh’s house while she’s asleep. Fortunately, she hears the intruder approaching to attack her and wakes up...