Drug Enforcement Agency Police ZHAO Xiao column suddenly received a thorny dangerous tasks . In order to arrest the police to track the years of drug lords , " Wei boss , ZHAO Xiao column posing with their looks the same drug traffickers Zhang Sheng to Wei boss connector . Everything is ready , ZHAO Xiao column to finally meet who always act in a cautious drug dealer , but found that the relationship between Zhang Sheng Wei boss but otherwise seems strange . And the accidental discovery of the bizarre life experience . ? Zhang Sheng girlfriend " Xiaoxiao ," mouth , ZHAO Xiao -chu know Zhang Sheng Wei boss , parent-child relationship , and the unexpected discovery and Zhang Sheng real biological brother . ZHAO Xiao -chu 's mother unknowingly , and Wei boss in love , when to know the true identity of his drug lords , took the two children decided to leave , but because of the burden of life , but unfortunately one child ZHAO Xiao column send to dependents and others . Wei boss and repeatedly , and you want to Zhang Sheng away , mother desperate blocked , Wei boss manslaughter and died . All of this 5-year-old Zhang Sheng is within sight, from the seeds of hatred will take root in his heart . He wants revenge for the mother , so reluctantly embarked on a drug trafficking of no return . ? Learned the truth , ZHAO Xiao -chu and Zhang Sheng recognition, Wei boss by his conscience , committed suicide . ZHAO Xiao- column , with mixed feelings personally Zhang Sheng rope in France , while he continued the work of undercover code-named " Tiger " . ....