Kim Taehyung knows he doesn't belong to this era, 30 years in the future, or for what it is now, the present. Year 2043, Taehyung had been stuck to his age for a little less to thirty years. But no, this man isn't a time traveller, or one that had magically froze the time, Taehyung was a special one. He was a human, with a silver heart. Taehyung was the special card, an experiment -- of all things whack, he became successful, and lived. 

Taehyung heart doesn't pump blood naturally, rather, batteries are what keeps him alive. But no one knows this but him, and a few of the people from the institution that had made him, that had programmed him.

Work. Home. Sleep. Work. Home. Sleep. Everything was a routine for Taehyung, he had claimed it such, knowing he was a half-machine anyway.

And maybe, his functioning heart has what made Taehyung what he is today, a cold human being, the epitome of the so called, "heart-of-stone". 

But as he meets this bubbly new workmate, Hoseok, who wants any other name but that, his world's view changes, his heart turns in twists and turns, yet hopefully not until to malfunction. 

Could a programmed heart feel such ways without the installed software?