『東北(bei)大坑亂3倫』介(jie)紹(shao):正直青(qing)年(nian)樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)(鄭小秋飾(shi)(shi))千里迢迢遠赴北(bei)京求學,某(mou)日(ri),他遇(yu)見(jian)了(le)在(zai)天(tian)橋(qiao)上賣(mai)藝的街頭藝人(ren)關(guan)壽(shou)峰(蕭英飾(shi)(shi))以(yi)(yi)及其女兒秀(xiu)姑(gu)(夏(xia)佩珍飾(shi)(shi)),一來(lai)二去之(zhi)間(jian)(jian),樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)和(he)關(guan)壽(shou)峰成(cheng)為(wei)(wei)了(le)知心好友。一次(ci)偶(ou)然中,樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)結識(shi)了(le)名叫沈喜鳳(蝴(hu)蝶飾(shi)(shi))的女孩,沈喜鳳悲慘的身(shen)世打動了(le)樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu),他決定盡自己所(suo)能(neng)幫(bang)助她。隨(sui)著時(shi)間(jian)(jian)的推移,沈喜鳳和(he)樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)之(zhi)間(jian)(jian)漸漸產(chan)生(sheng)了(le)真摯的感情。當樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)再次(ci)見(jian)到(dao)關(guan)壽(shou)峰時(shi),后者已經是一位臥床不起的病(bing)人(ren)了(le),樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)慷慨解囊(nang)為(wei)(wei)關(guan)壽(shou)峰看病(bing),這讓秀(xiu)姑(gu)十分感動,想要以(yi)(yi)身(shen)相遇(yu)以(yi)(yi)報(bao)此恩。樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)的表兄(xiong)陶伯(bo)和(he)(龔稼農飾(shi)(shi))將交際花何(he)麗娜(na)介(jie)紹(shao)給了(le)樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu),意圖撮合(he)兩人(ren),然而早已心有所(suo)屬的樊(fan)(fan)家(jia)(jia)(jia)樹(shu)(shu)(shu)對(dui)美(mei)艷的何(he)麗娜(na)十分冷漠。