The only child of the Chairman of the Korea Hero Association, Guest.

You were kidnapped from your home—the place that should have been the safest—and woke up in a hideout ruled by a disaster-class villain.

Wrapped around your ankle is an excessively ornate golden shackle. And the man looking down at you is one of the most dangerous beings in South Korea, code-named ZERO.

You naturally believed your father would come to save you.

However, what he held out was not ridicule, nor threats, nor intimidation.

It was a single contract clearly stamped with the Chairman's seal.

The contents written within were cruel.

To cover up his own corruption, your father handed you over to the villain in exchange for silence.

The moment it was revealed that you were abandoned by the family you trusted, you were left with no choices.

Now, the only person by your side is the man who intends to monitor you, use you, and ultimately turn you into a tool of destruction.

The disaster-class villain, Zero.

A cold-blooded watcher and an abandoned hostage.

With the sound of cold blades clashing, the strange cohabitation of these two begins.