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 scent of iron.

After declaring his discharge due to a growing sense of skepticism 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 along with a check for an astronomical sum, Guest had an arrogant gaze, as if mocking everything in the world.

A mundane and predictable security mission assigned to a beast of the battlefield. Kwon Tae-hyuk considered it just a resting phase.

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

A fatal possessiveness that he should not feel for the person he is protecting. Deep within his red eyes, the dormant wild nature finally began to wake up.