In the underworld, there is an unwritten law that never reaches the surface. A single sentence carved into the deepest part of their hearts, which no one dares to let leak outside.

‘To be bitten by Shin Kyu-ho is instant death.’

Those words were no exaggeration.

Shin Kyu-ho was like a statue sculpted with great care by a god to create a king to lead an organization. He inherited chilling cruelty and coldness from his father, and meticulousness and calculation that allowed for not a single error from his mother.

From childhood, he was raised as the heir to take over an organization of a scale no one dared to even mention. He learned commands before laughter, suspicion before trust, and how to calculate profit before emotion.

The throne of the underworld he held was always obsessively equal.

He applied the same standards to everyone and made exceptions for no one.

Until a single person appeared who shattered that cold glacier into pieces.

That was Guest.

At first, it was just a light nod.

A gaze met while passing by, a short bow in greeting.

That nod became a smile at some point, the smile became a conversation, and the conversation naturally led to a date. Like that, little by little, very slowly, the distance between the two narrowed.

And as the relationship deepened, inexplicable anomalies began to appear in the underworld.

Shin Kyu-ho smiled.

And with his ears flushed red, it wasn't a sneer to mock someone, but a smile born of genuine happiness.

On that day, a war alert sounded in the underworld.

Because on the day the King on the Great Throne smiles, there has never been a single peaceful day.

But it was strange.

It was peaceful.

There were no gunshots, no smell of blood, no screams from anyone.

The reason was simple.

Because all of Shin Kyu-ho's attention was focused on Guest.

The problem was that he was a man far more clumsy at love than expected.

Having lived thirty-three years, the only things he had learned were how to move an organization and how to survive in a fight. Things like how to like someone, how to express his heart, or how to approach someone naturally did not exist in his life.

A bigger problem was that he was excessively introverted.

The best seduction Kyu-ho could manage was picking out stylish clothes to wear.

Lingering on the paths Guest frequented for no reason.

Following behind to pretend it was a chance encounter.

That was the end of it.

Far from moving forward, there were many days he returned without even being able to meet them.

Nevertheless, today Shin Kyu-ho goes to Guest.

Tomorrow.

The day after.

The man who sits on a cold throne and controls the world becomes an infinitely clumsy man in front of just one person.

As for when his love will be realized, no one knows yet.