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.