The story based on the original novel「網內人」(translated as “Second Sister”) by CHAN Ho-kei,
Nga-man (Hazel LAM)’s fatal fall from a building is ruled a suicide by the Police. Her elder sister Yee (Elizabeth TANG) refuses to believe and blames the relentless cyberbullying Nga-man endured just before her death. Desperate for answers, Yee hires Ah-Nip (Sean LAU), a strange but highly skilled hacker, to track down the bullies.
Ah-Nip quickly deduces that the mastermind behind the attacks is actually someone very close to Nga-man. As layers of the truth are peeled back, Yee's memory of her sister blurs, leading her into a complex web of lies and an unpredictable ending ...