Zhou Yuan is the head of the major crimes division of the police department. During an undercover operation to catch a drug dealer, he inadvertently crosses paths with Bai Xiao Lu. Her impulsiveness almost causes the entire sting to fail. Upon graduating from school, Lu Hao requested to be transferred to major crimes division to fulfill his aspirations to become a good police officer. However, Zhou Yuan's parenting tactics at work often result in tension between the two.