Mun Ju, a seasoned diplomat and former ambassador to the United States, has earned the trust of the international community through her sharp judgment and decisive actions. When she uncovers political maneuvering behind a high-profile assassination linked to both South and North Korea, she is drawn into a dangerous web of secrets. Meanwhile, San Ho, an elite mercenary with an obscured past and unknown nationality, operates in the shadows. A man of few words but lethal precision, he becomes an unexpected ally in Mun Ju's pursuit of the truth. Together, they navigate a treacherous world of power, deception, and buried conspiracies—where uncovering the truth could mean risking everything.