Citizen Zero

In a city where every citizen is tracked, ranked, and scored, Xiaoyi has none. No record. No number. No place in the system. She survives by staying invisible—head down, voice low, life small. But the day the surveillance network flags her as an error, she is seen by the worst possible person: Kang Doyoon, a cold, brilliant man tied to the machinery that controls the city. Now the system wants answers.And so does he. Because in a world where everyone has a score, a girl with zero should not exist.