『19歲女(nv)RAPPER潮水歡迎你(ni)』介紹(shao):上(shang)海(hai)灘(tan)十里洋場(chang),是無數人(ren)追(zhui)夢的(de)樂園(yuan)……天生神力的(de)青年馬(ma)(ma)永(yong)貞(伍允龍(long)(long)(long) 飾)從家鄉來到(dao)上(shang)海(hai)謀生,在(zai)當(dang)時(shi)占有上(shang)海(hai)一(yi)半(ban)勢(shi)力范圍的(de)老(lao)(lao)幫(bang)派斧頭(tou)(tou)幫(bang)治(zhi)下謀得一(yi)份(fen)苦工,豈料因同伴竊取斧頭(tou)(tou)幫(bang)的(de)鴉片(pian),在(zai)后者發難之際與同住貧民區的(de)老(lao)(lao)鐵(洪金寶(bao) 飾)將工友救下,為(wei)了追(zhui)蹤那批鴉片(pian)的(de)下落(luo),馬(ma)(ma)永(yong)貞與上(shang)海(hai)另一(yi)半(ban)勢(shi)力范圍的(de)主人(ren)——新近崛起的(de)龍(long)(long)(long)七(安(an)志(zhi)杰 飾)不打不相識,并因為(wei)受(shou)到(dao)斧頭(tou)(tou)幫(bang)排(pai)擠,不得不與同伴們(men)投奔龍(long)(long)(long)七。因秉持母親的(de)教(jiao)誨,馬(ma)(ma)永(yong)貞無意加入龍(long)(long)(long)七的(de)幫(bang)會,但龍(long)(long)(long)七不以為(wei)意,反與之結(jie)為(wei)知交。不久,那批鴉片(pian)的(de)真正主人(ren)——日本人(ren)為(wei)了介入上(shang)海(hai),利用斧頭(tou)(tou)幫(bang)和(he)龍(long)(long)(long)七的(de)矛盾欲置龍(long)(long)(long)七與老(lao)(lao)鐵等人(ren)于(yu)死地(di),馬(ma)(ma)永(yong)貞忍(ren)無可忍(ren),誓要復仇(chou)……