Yeonjun has spent years working in South Korea’s intelligence service, earning a reputation as one of their most reliable and dangerous agents. Calm under pressure, sharp-minded, and emotionally restrained, he lives by discipline and orders alone. His world has always been shadows, coded messages, and missions no one else could handle. So when he’s suddenly reassigned, he expects something bigger — something deadlier. Instead, he’s given what sounds like the simplest task of his career: become a bodyguard.

But not just for anyone.

Choi Beomgyu is the president’s son — and unofficially, the nation’s “prince.” Born into a family with royal blood, he grew up surrounded by luxury, cameras, and expectations he never asked for. Beautiful, witty, and infuriatingly spoiled, Beomgyu hides his sharp intelligence behind playful sarcasm and careless smiles. He hates being watched, hates being controlled, and treats every new bodyguard like an inconvenience. To him, Yeonjun is just another cold, silent guard assigned to babysit him. To Yeonjun, Beomgyu is reckless, stubborn… and trouble waiting to happen.

Yet threats lurk closer than either of them realizes. Political enemies, assassination attempts, and hidden conspiracies force them to stay side by side day and night.