Guo Qiang is a Chinese man living in America who enjoys a carefree, modern lifestyle alongside his girlfriend, Xiaowei. His world is completely upended when a young American-born boy named Xiao Gu appears on his doorstep, claiming to be his biological son from a past relationship. Forced to take responsibility overnight, Guo Qiang must navigate the daunting and hilarious challenges of fatherhood while dealing with cultural clashes and the skepticism of those around him. As Guo Qiang learns how to care for his son, he is joined by his quirky roommates and eventually Xiaowei, who must decide whether she can accept this sudden family dynamic. The series explores themes of maturity, love, and responsibility as a man who acts like a child is forced to grow up and become a real father.