Felix Chong and Alan Mak, the writers of the classic Infernal Affairs trilogy, are back to the undercover thriller (the former as screenwriter and the latter as co-director with cinematographer Anthony Pun), and they’ve made the anti-Infernal Affairs. Extraordinary Mission follows Lin Kai (Huang Xuan) a cop sent to infiltrate a drug cartel by his superior Li Jianguo (Zu Feng), a former undercover himself. Fiercely motivated by the death of his mother from a drug overdose when he was a child, Lin quickly penetrates the cartel, until he finds an occasion to meet its ruthless, possibly deranged leader Eagle (Duan Yihong), and earn his trust to then dismantle the whole network.