A mysterious plane crash kills over 200 civilians, including Cha Dal-gun’s (Lee Seung-gi) nephew. Determined to find out the truth behind the accident, Cha Dal-gun embarks on an investigation that leads him to a tangled web of corruption. His life intertwines with Go Hae-ri (Bae Suzy), a covert operative for the National Intelligence Service.
Cha Dal-geon encourages his nephew to go to Morocco with the taekwondo demonstration group. Go Hae-ri walks in late to a meeting at the Korean embassy.
Cha Dal-geon makes a disquieting announcement to the other bereaving families and implores Go Hae-ri for help, but she seems to be hiding something.
Hae-ri remains skeptical about the flight-deck voice recording but is told that the evidence points to a faulty aircraft. Dal-geon is ambushed.
Dal-geon gets a call from someone out of the blue and is approached by a journalist, who claims to be pursuing a story about the plane crash.
Dal-geon attempts to alert the press about what he knows -- but someone interferes. Hae-ri contacts Gi Tae-ung to get answers about the flash drive.
The NIS takes Dal-geon to a safe house. Tae-ung questions O Sang-mi about her husband’s involvement in the plane crash but is ordered to release her.
Dal-geon sees someone who’s supposed to be dead. Hae-ri and Tae-ung head to Morocco to capture their suspect. The NIS takes Jessica Lee into custody.
Dal-geon runs into trouble while trying to carry out his own search. Tae-ung is displeased that the operation in Morocco doesn’t go as planned.
Dal-geon and the agents try to keep Kim Woo-gi alive, and request NIS backup. Jessica moves to pin the plane crash on someone else.
After running from the embassy, Dal-geon and the others head back to Korea another way. Min Jae-sik confronts Gang Ju-cheol.
Dal-geon and Hae-ri make contact with Jae-sik. Jessica and Yun Han-gi see a big win at the National Assembly. Tae-ung undergoes scrutiny.
The plan to get Woo-gi safely to the courthouse takes an unanticipated turn -- and throws the Blue House into panic mode.
Dal-geon's explosive on-air accusation toward the president sparks a media storm. Jessica's press conference goes south quick.
When O Sang-mi disappears, Dal-geon and Hae-ri realize there's more to the situation. Meanwhile, Hong Sun-jo takes advantage of the crisis.
Sang-mi leaves behind a warning about a shady figure named Samael, putting everything Dal-geon thought he knew about the crash into question.