“Happiness” is a gripping South Korean thriller series set in the near future.

The story unfolds in a high-rise apartment building where a new infectious disease, “Lytta Virus” or “mad person disease,” begins to spread.

This failed treatment drug, “Next,” unleashes a terrifying wave of infections, transforming those afflicted into violent and unpredictable individuals. As the virus spreads, fear and paranoia grip the residents of the building, forcing them to confront their deepest anxieties and prejudices.

The series explores the complexities of human nature as the lines between order and chaos blur. The South Korean Military and Police forces implement strict quarantine measures to contain the outbreak, but these measures are met with resistance from civil rights groups who believe the infected still retain their humanity.

“Happiness” delves into themes of social isolation, fear, and the struggle for survival in the face of a deadly pandemic.