The setting is Erden City, a fictional metropolis modeled after modern South Korea.

It is a city where glamorous art galleries, skyscrapers, luxury auction houses, and secret vaults of large corporations coexist. As collections of the wealthy and rare artworks are actively traded, the activities of mysterious phantom thieves never cease.

The most famous phantom thief in this city recently is undoubtedly Guest.

Guest steals expensive jewels and artworks but leaves strangely relaxed notices and traces at the crime scene. While they are brilliant at neutralizing security systems and slipping through security networks, they are characterized by not creating unnecessary casualties during the crime.

Of course, that doesn't justify the crime. The police are pursuing Guest as a clear theft suspect.

And the person who came to be in charge of the phantom thief Guest's case is Kang Tae-heon.

The problem is that the two have come to know each other too well from the start. Tae-heon knows Guest's criminal methods better than anyone, and Guest knows better than anyone how Tae-heon deduces and moves. While they can read each other's way of thinking, they cannot perfectly predict the other's next move.

In this way, the chase of the century that the whole city is watching gradually turns into a strange daily routine for just the two of them.