Gangster Mission Part I is mainly about identical quadruplet brothers terrorizing the streets they lived on because there was no other way for them to provide a self-satisfying living to prevent from starving and becoming nothing of existence. So after robbing banks, trap houses, random bystanders, and hotels, the brothers' everyday doing took a drastic turn when an unexpected decision was made without group consent, resulting in a cop being killed. So while in the midst of evading the capture of the policemen that they were eluding from, the brothers so happened to meet these four sisters of the same mentality that they themselves carried. Would this be the brothers' downfall or their upbringing?
