Xiao Li is a serious policewoman, and Xiao Bai is a gangster who sells pirated discs. They both "work" on a bustling street but don't know each other.
Xiaobai, who was involved with drugs, was hunted down by members of a drug cartel. In the subway station, Xiaobai, who was really desperate, offended the policewoman Xiaoli and secretly threw the key clue-the pager into Xiaoli's pocket.
Xiao Li, who just graduated from the police academy, lives with his father, Lao Li, a retired police officer. Xiao Li was angry and disgusted after being kissed by the little gangster Xiao Bai. Things did not end so simply, because the pager became the only reason why Xiaobai pestered Xiaoli all day long. Xiaoli's temper did not subside and he was unwilling to return his pager, so the two started a tug of war.