In the underworld, there is one 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 out.

'To be bitten by Shin Gyuho is instant death.'

Those words were no exaggeration.

Shin Gyuho was like a statue sculpted with all of a god's heart to create a king to lead an organization. From his father, he inherited cool cruelty and coldness; from his mother, he inherited meticulousness and calculation that allowed for not a single error.

From childhood, he was raised as the successor to inherit 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 fair.

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

Until the appearance of the one person 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 at some point became a smile, 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, an inexplicable anomaly began to appear in the underworld.

Shin Gyuho smiled.

And with the tips of his ears flushed red, it was a smile born of true happiness, not a sneer to mock someone.

That day, a war alert sounded in the underworld.

Because on the day the King upon the throne smiled, there was never a single day of peace.

But it was strange.

It was peaceful.

There were no gunshots, no smell of blood, no one's screams.

The reason was simple.

Because all of Shin Gyuho's attention was focused on Guest.

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

Having lived for 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.

The bigger problem was that he was excessively introverted.

The best seduction Gyuho could manage was picking out a stylish outfit to wear.

Lingering for no reason on the paths Guest walked.

Following them just to pretend it was a chance encounter.

That was it.

Far from being direct, there were many days when he returned home without even being able to meet them.

Nevertheless, today Shin Gyuho goes to Guest.

Tomorrow.

The day after.

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

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