In Hong Kong in 1996, the city's deepest shadow was hidden under the neon lights of Causeway Bay. Chen Haonan, the best graduate of the police academy, was assigned an impossible task - to sneak into Hongxing Society, approach the leader Jiang Tiansheng, and collect evidence enough to dismantle the entire gang.
He started out as a bad boy on the street as a young and Dangerous boy, and won the trust of his brothers with his fists and loyalty. Pheasant, Datian Er, foreskin, and nest skin, these young people who have the word "brother" carved into their bones allow him to live out another kind of reality in lies.
But when the undercover mission entered the fifth year, when Boss B was wiped out, his girlfriend Xiao Ba died tragically, and his brothers fell one after another, Chen Haonan found that he had no way to retreat between the black and white paths. The police suspected him of betrayal, the society asked him to surrender his name, and his conscience tortured him every night——
Who are you?
