What if the woman you love had to marry another man... for the mission? Jeon Jungkook is known in the shadows as one of the agency's deadliest secret agents. Cold. Precise. Untouchable. But behind the masks and codewords, he has one weakness- his wife. Ashley. A fearless undercover agent living a double life of lies, secrets, and dangerous missions. When the agency discovers clues connecting billionaire businessman Jackson Wang to a powerful illegal organization known as Eclipse Route, Ashley is given an impossible mission: Marry him. Now trapped inside the mansion of a man who hides darkness behind kindness, Ashley must play the role of Jackson's perfect wife while secretly feeding information to the agency. But the deeper she goes into Jackson's world, the more dangerous the mission becomes. Suspicion rises. Feelings blur. Trust breaks. And Jungkook- forced to watch the woman he legally loves live beside another man- slowly begins losing control. In a world where identities are fake and love can destroy missions, one mistake is enough to ruin everything. Because in this operation... trust is deadly.