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 Gun becomes an awakened tiger in the face of his nephew’s death in a mysterious plane crash. As an orphan himself, he had raised his nephew singlehandedly in place of his brother who had passed on. Triggered by the large-scale cover-up of the incident, he sets off on a journey to discover the truth.

Go Hae Ri is the eldest daughter of a marine who had died during an operation. She has always wanted to be a normal civil servant to support her family, but life had other plans and she ends up as a National Intelligence Service (NIS) agent.

Their lives intertwine as they discover a tangled web of corruption behind the plane crash.