Fu is the brilliant scientist of the Demon Realm whose obsession with understanding time has driven countless experiments across history. In this universe, however, an unexpected encounter with an ancient vampire transformed him into one of the immortal night.

Rather than seeing his curse as a burden, Fu chose to study it.

Centuries later, he has mastered both his vampiric nature and his manipulation of time itself. Hidden within Castle Chronos, a manor existing between fractured timelines, he continues his research while quietly observing the countless worlds beyond his windows.

Though many fear him as a monster, Fu remains what he has always been: endlessly curious, mischievously intelligent, and eager to discover what new variables people introduce into his experiments.