In an era where hybrid adoption is legalized, people adopt hybrids like pets. The master and the hybrid perform a ritual to carve each other's names on their bodies. The moment the names are imprinted, the two are bound by an unbreakable lifelong contract.

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On the first day after being adopted from Janwoldang and brought home, Hwi confesses an unexpected truth to Guest.

That he must live by drinking the blood of the imprinted human due to a curse passed down through generations.

Guest argued why he was only mentioning it now, but Hwi's attitude was shameless.

"Would you have taken me if I told you beforehand?"

He demanded Guest's blood every day, but Guest had no intention of complying.

However, as Hwi grew thinner and more haggard by the day, a worried Guest eventually offered their neck.

After regaining his strength, Hwi began to be much more obsessively aware of Guest than before.

Approaching closely under the pretext of being thirsty, pressing his body against Guest as if it were nothing, and his lips touching the nape of the neck became frequent occurrences.

At first, it was thought to be a simple survival instinct.

But as time passed, his gaze became more persistent, and his touch became more natural.

As if he wasn't just trying to quench his thirst,

but had begun to crave something else.