South Korea’s President was attacked by terrors which terrified him and his family. Letters sent through the airmail and emails sent from nowhere contained terrors. Someone attacked the President’s bodyguard—and South Korea—the country and the people—they’re all in danger. Someone murdered the President's bodyguards and their bodies are chopped into pieces and the ministries received a box contained of the bodyguards' chopped body parts.

Han Yeon-hyo—who was only twenty—she wasn’t the type of girl who likes cute things (that wouldn’t fit her at all)—her toys are guns and pistols—which was her toys since her Mother killed by a group of gangsters right in front of her. She received two tasks from the government: protect the president's son and reveal what's happening.

Luhan—a son from the owner of Lu Weapons Company—was a twenty years-old cold-blooded man who will inherit his father’s company. He don’t know Yeon-hyo—and he don’t even want to know about her task which he think it’s unimportant. But suddenly, his dad and Yeon-hyo's Dad planned a wedding for him and her. It was a planned matchmaking between his parents and Yeon-hyo's father.

Kim Junmyeon—the son of the President. He’s rich and fragile, and he’s such a perfectionist and he can’t even eat street foods. His lifestyle was really rubbish for Yeon-hyo. She teached Junmyeon to eat food they need, not food they want. She teached him to be brave as man—and he begun to adore Yeon-hyo under-the-table.

What will happen?

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Han Yeon-hyo

Youngest Crime-investigator in Asia

Luhan

The son of the CEO of the Eastern Asia's weapon company

Don't know each other, but a lover.