The alarm bell rang, and police officers Guan Zhixuan, Xu Xian, Brother Shu and Brother Chan chased the robbers, but the cold-blooded gangsters snatched away the police gun. Brother Shu was shot dead on the spot!A desperate gangster changed the lives of four policemen with a cold-blooded shot... Shu Ge died in the line of duty, Xuan joined the mobile unit again, Chan Ge was transferred to the Police Miscellaneous Investigation Team, Xian quit the police force and infiltrated the largest gang in West Kowloon.He became the unscrupulous "top horse" of West Kowloon King, and lived an inhuman life with swords and swords and loud killings. However, he was still an undercover police officer lurking in the underworld.

After the death of the unscrupulous drug trafficker Liang, the throne was left vacant and heroes fought for it. Another bloody storm ensued, resulting in countless deaths and injuries.Superintendent Dai asked Xian to continue to be an undercover agent and took over Liang's entire society.Unexpectedly, Xian's identity as an undercover agent was exposed, and he was hunted down by his enemies in the underworld, and almost died.At this time, Xu Xian's choice came to a crossroads in life. Should he be a West Kowloon king with billions of drug transactions in the underworld every year? Or should he become a policeman and work as a "No Room For Crime" with a salary of only more than 30,000 yuan a month??