西九龙重案组臥底警员山哥向高级督察唯 Sir 发送线报，本港最大毒枭“金先生”将亲自交易今年最大宗的毒品，涉及金额达二千万美元。然而这次 交易竟然是毒枭们为了找出警方臥底的调虎离山计。臥底山哥不慎暴露遭遇贩毒 集团全力追杀，其臥底的身份也被突然删除。一时之间山哥陷入黑白两道的漩涡纠纷之中。 山哥必须在期限内证明自己的清白并且粉碎大毒枭“金先生”的阴谋……

電影講述了一起橫跨全港的大型毒品案件，警方慘遭黑幫報復，死傷慘重，黑幫卧底山哥身陷囹圄，正義與邪惡的角鬥已然拉開了序幕。

西九龍重案組臥底警員山哥向高級督察唯 Sir 發送線報，本港最大毒梟“金先生”將親自交易今年最大宗的毒品，涉及金額達二千萬美元。然而這次 交易竟然是毒梟們為了找出警方臥底的調虎離山計。臥底山哥不慎暴露遭遇販毒 集團全力追殺，其臥底的身份也被突然刪除。一時之間山哥陷入黑白兩道的漩渦糾紛之中。山哥必須在期限內證明自己的清白並且粉碎大毒梟“金先生”的陰謀……

Brother Shan, the undercover in the Major Crime Unit in West Kowloon sent a tip to Sir Wei, the senior inspector saying that the biggest drug trafficker in Hong Kong, “Mr. Jin” would deal the largest amount of drugs of this year himself with the money involved being 20 million dollars. However, this time, the deal is actually a strategy by the drug traffickers to lure the police undercover out. The undercover Brother Shan was accidentally exposed and the drug traffickers were chasing him in full force. On the other hand, suddenly, his undercover identity was no longer recognized and he got caught in the conflict between the good and the evil. Brother Shan needs to “prove his innocence” in time and smash the scheme of the big drug trafficker “Mr. Jin".

홍콩을 휩쓴 대규모 마약 사건을 비밀리에 조사 하던중 경찰이 갱단의 보복을 받아 막대한 사상자가 발생하고, 또한 대규모 마약 거래가 진행되고 있는 현장을 경찰이 급습하지만 요원들만 부상을 입고 아무런 성과도 얻지 못한다.언더커버 요원 류이산(아산)은 허스지 조직의 보스 자리를 놓고 피콕과 경쟁을 벌이던 중 경찰의 기습으로 신분이 노출될 위기에 처한다. 배신자로 몰린 류이산은 조직의 신임을 되찾기 위해 고군분투 하고,갱단에 잠복경찰인 산게가 투옥되면서 정의와 악의 싸움이 시작되는 이야기를 그린다.

Шань (Джордан Чан) двадцать лет работает под прикрытием. Теперь он лидер банды Хэсидзи и уже начинает сомневаться, преступник он или полицейский. Его главная задача вычислить таинственного мистера Цзиня, наркобарона, отдающего приказы банде Хэсидзи по телефону. И Шань не отступит от своей цели.

ตำรวจนอกเครื่องแบบคดีอาชญากรรมเกาลูนตะวันตกซานเกอรายงานเบาะแสให้สารวัตรระดับสูงเหวยเซอร์ว่า “มิสเตอร์จิน” นักค้ายาที่ใหญ่ที่สุดของเกาะจะทำการแลกเปลี่ยนยาล็อตใหญ่ที่สุดของปีนี้โดยมีมูลค่าสูงถึงยี่สิบล้านดอลล่าห์สหรัฐ แต่การแลกเปลี่ยนในครั้งนี้บรรดานักค้ายาได้วางแผนเพื่อล่อสายสืบของตำรวจออกมา ซานเกอไม่ทันระวังถูกพวกโจรเปิดเผยตัวตนจนถูกองค์กรตามฆ่าสุดชีวิต สายสืบคนอื่นก็ถูกจำกัดทิ้งราบคาบ ซานเกอกลายเป็นอยู่ระหว่างความสับสนอลหม่านของขาวดำไปในชั่วพริบตา ซานเกอจำเป็นต้อง “พิสูจน์ความบริสุทธิ์ของตัวเอง” ในเวลาอันจำกัดพร้อมทั้งทำลายแผนชั่วของ “มิสเตอร์จิน” ด้วย...

Cảnh sát nằm vùng Sơn Ca của tổ trọng án Tây Cửu Long gửi tin cho chỉ huy cấp cao Duy Sir, kẻ buôn ma túy đáng gờm nhất Hồng Kông "Kim tiên sinh" sẽ đích thân giao dịch chuyến ma túy lớn nhất trong năm, đồng thời liên quan tới số tiền những hai mươi triệu đô. Tuy nhân, lần này lại là cái bẫy điệu hổ ly sơn để tìm ra cảnh sát nằm vùng của đám buôn ma túy. Sơn Ca bất cẩn bị bạo lộ thân phận. Cả tập đoàn dồn lực đuổi giết, thân phận nằm vùng cũng đột ngột bị mất, Sơn Ca bỗng chốc rơi vào vòng xoáy tranh chấp của hai bên hắc bạch đạo. Sơn Ca phải "chứng minh được bản thân trong sạch" trong thời gian đã định, đồng thời phá hoại âm mưu của trùm ma túy "Kim tiên sinh"...