Mun-ju resigns as an ambassador to support presidential candidate Jun-ik; but when they attend a mass for peaceful reunification, a suddenballoonshot rings out; amid the turmoil, a mysterious man named San-ho saves her and vanishes.

As Mun-ju continues her investigation, Jun-ik's family tries to intervene. Determined to get to the bottom of it all, Mun-ju declares her intent to run for President. Meanwhile, staff in the White House grow concerned over an intelligence briefing, and one of them takes measures into their own hands.

With Ok-seon's backing, Mun-ju quickly rises as a leading presidential candidate, but on her way to declare her candidacy at Gwanghwamun Square, an unexpected crisis strikes, and San-ho rushes in to save her.

Munju finds herself conflicted over the mysterious mercenary. Meanwhile, Changhee makes a discovery that will threaten national security.

As one by one, the signs come true, Munju throws a Hail Mary in an attempt to warn the country about its march to war, not sure if they will survive.

Mun-ju and San-ho grow closer but a leak threatens it all. As San-ho looks into the leak, Mun-ju receives some intelligence that changes everything.

Mun-ju chases the secret of the submarine and Jun-ik's estate. Ready to face passing, she risks passing in a stormy encounter with the real Stella Young.

As the threat of war resurfaces, Munju heads into enemy territory to bring an end to it all with Sanho following close behind.

The mastermind behind everything finally reveals their cards, but can Sanho do what's needed to stop the outbreak of a global conflict?