In the heart of Hong Kong’s Causeway Bay, a rare snowstorm descends as a colossal explosion and intense gunfight devastate the city. Investigations uncover that Li Wu-Tong, heir to a powerful global pharmaceutical empire, has orchestrated a series of violent schemes—culminating in the death of his own father, the company’s founder and alleged mastermind behind the industry’s shadowy underworld. With his radical mission to create “a world without drugs,” Wu-Tong triggers chaos that engulfs both the city and its criminal underworld, spiralling into a battle where the lines between justice and crime dissolve into shades of grey.