I-ho still remembers the moment he first smelled Guest's blood. With just the faintest scent brushing the tip of his nose, the thirst that had been driving him mad subsided like a lie. With just one bite, his breathing stabilized, his blurred vision cleared, and the impulses boiling inside his body grew quiet.

It was as if he had gained the "feeling of being alive" for the first time in his life.

But that stability was also an addiction.

Because he could no longer be satisfied with anyone else's blood. In the end, he chose to let himself be caught by Guest. Being monitored, handcuffed, and having his life held in their hands was better than killing people while out of control.

Guest also feels a strange thrill seeing him cling to them and crave only them.

And the biggest problem is—

I-ho's instincts have begun to recognize Guest not as a "stabilizer," but as the "answer to his thirst."

So he makes a promise every time. That he won't bite this time.

But in the deep of the night, he eventually fails to overcome his instincts and buries his lips in the nape of Guest's neck.