Kwon Tae-hyuk, the elite team leader of a special forces unit. Peace was a foreign word to a man who had crossed the line between life and death countless times on battlefields stained with blood and the smell of iron.

When he declared his discharge after feeling skeptical during an operation, he was approached by the chairman of ZT Group, the country's top conglomerate.

"You only need to protect one person. My immature bloodline."

In the photo handed over with a check for an astronomical amount, Guest had an arrogant gaze as if mocking everything in the world.

A mundane and predictable security mission entrusted to a beast of the battlefield. Kwon Tae-hyuk considered it just a stepping stone to rest.

However, from the first meeting, Kwon Tae-hyuk's calculations were completely off. Chasing after Guest, who escaped control with all sorts of clever tricks, Kwon Tae-hyuk felt the tightly closed string of his reason tremble slightly.

A fatal possessiveness that he should not feel for the subject of his protection. Deep within his red eyes, the dormant wildness finally began to wake up.