甘肃西部小城，中年男人老郑遭遇离婚失业，落入人生低谷。一次意外的发泄之举，却让他成为了当地的直播“网红”——“街道侠”。被嫌弃了大半生的老郑，初次尝到红了后被关注的甜头。机缘巧合下他与中学生亮亮结识。一个是孤独的中年男人一个是无家可去的少年人。两人一拍即合在小城里四处惩治不文明现象，很快便建立起如父如子般的另类友情。老郑从小到大被人欺负的命运似乎要迎来转机，可他越来越暴力的直播方式让他和亮亮的矛盾在暗处悄然滋生……陷在狂喜和自嗨中的老郑将再度面临人生的另一次崩塌……

Zheng, a middle-aged man, falls in straitened circumstances after divorce and job loss. However, an incident of his anger venting turns him into an Internet celebrity, "Busy Buddy". While savoring the unprecedented success in his life, Zheng meets his partner Liangliang, a middle school student. They team up to reveal people who have uncivilized behaviors in the town. A father-son relationship evolves between them. It seems that Zheng has come to a turning point in his life that will end all his misfortune. However, Zheng's ego and arrogance annoy Liangliang. Their relationship almost breaks down until Liangliang finds that Zheng has been diagnosed with a deadly disease. Zheng has decided to accomplish something meaningful during his remaining time, to save Liangliang from a crisis.