After being transferred, SHEUNG SING is sent by LAI-KIT to monitor a drug warehouse. On the other hand, BING-GO and the others are getting ready to take action after receiving instruction from THE BEAST. Seizing the opportunity, BING-GO tips off HEI-WAH. BING-GO turns out to be an undercover cop who works for HEI-WAH. He was introduced to THE BEAST after being stabbed defending BIG WAI in prison. LAI-KIT is getting ready to lead his team to arrest drug lord YIM SAI-HAU, so SHEUNG SING wants to join them, but his request is denied. However, SHEUNG SING comes prepared, managing to arrive at the command post together with HEI-WAH. HEI-WAH swallows her pride and lets Senior Superintendent KAN KWOK-CHU to lead the operation, seeking to bring her son's murderer THE BEAST to justice. LAI-KIT's undercover HEI-YI is stalling in front of SAI-HAU to buy more time, above which she even risks herself to try the drug. Eventually, SAI-HAU starts getting suspicious. Seeing HEI-YI in danger, LAI-KIT, as persuaded by SHEUNG SING, defies orders to go to her rescue.