Cheng Lang (Liu Chengjun) was once a professional Sanda athlete who won championships in many competitions and was in the limelight. However, in a very important competition, Cheng Lang lost, and this failure made the conceited Cheng Lang fall into a trough and unable to extricate himself. He Ran (Lan Yan) is Cheng Lang's girlfriend. Although she loves Cheng Lang deeply, his indifference to her and his excessive obsession with Sanda make He Ran frustrated and leave her son (Wang Yiming) alone. In this way, Cheng Lang began his career as a father raising his son alone. At the beginning, Cheng Lang, who had no experience, had no idea how to take care of the child and was at a loss, so he made a lot of jokes and troubles. However, as time went on, the bond between Cheng Lang and his son gradually deepened, and the two embarked on the journey of finding their mother together.