上世纪八十年代，马丁（霍建华 饰）和三个亲如兄弟的小伙伴在北京的胡同里一起长大。在高中毕业前夕，一场由马丁引发的变故使他和兄弟三人分崩离析。青春落幕，马丁远走国外，自此销声匿迹。多年以后，已经成为上市公司副总的马丁突患脑瘤，孑然一身的他准备平静地迎接死亡，心底却隐隐有一种羁绊，让他无法割舍。马丁想在离世之前解开宿怨，重拾友情。人到中年的兄弟四人携手创业，每个人的生活都在发生着改变，旧时友情在彼此心中慢慢复苏，马丁也重燃生活的希望。
The story of a young group of siblings pretty much abandoned by their parents, surviving by their wits - and humor - on a rough Manchester council estate. Whilst they won't admit it, they need help and find it in Steve, a young middle class lad who falls for Fiona, the oldest sibling, and increasingly finds himself drawn to this unconventional and unique family. Anarchic family life seen through the eyes of an exceptionally bright fifteen year old, who struggles to come of age in the context of his belligerent father, closeted brother, psychotic sister and internet porn star neighbors.
该剧改编自和山やま的同名漫画，漫画两部分分别描述了神秘而充满魅力的林美良，和由于初中过于受人欢迎而向往平稳日常的二阶堂明的高中生活。电视剧中，漫画里未相遇的各个角色命运将会交织在一起。
《大城小爱》以都市情感和社会百态为基调，通过展现都市人群的职场、生活、家庭等各个生活层面，以小见大的洞察现代人的都市生活，力争打造出一部现实版的浮世绘。
