Hong Kong drug trafficker Liu Hao Yu colludes with Lin Yao Dong from Guangdong to build an underground drug manufacturing facility in the Chinese province. During one of his missions, anti-drug police enforcer Li Fei inadvertently discovers the truth behind the covert operation. Despite many obstacles from those in power who work behind the scenes to protect the drug ring, he and partner Song Yang launch a full investigation. Meanwhile, Li Fei's father Li Wei Min also heads up an operation as the anti-drug chief in an effort to wipe out the criminal syndicate.