After the war, the nation was divided into four sectors: the City, Safe Zone, Administrative Zone, and the Restricted Zone — where your district defines your class.

Seventeen years ago, an incident dropped Kang Jinha overnight from the highest social tier to the very bottom.

Now, he works as a gang member in the lowest zone and services VVIPs at an elite club.

One day, Yoo Yigeon — Executive Director of Yoo Kang Group, the world’s top defense company and the most powerful figure in the City — shows up in front of him.

Through coercion and persuasion, Yoo Yigeon forces Jinha to take his hand, and together, they begin to dig into the hidden truth behind the tragedy that occurred 17 years ago — a past that entwines them both.

As they pursue the culprit responsible for that long-ago disaster, something unexpected takes root: feelings they never anticipated for each other.