It's the wee hours at Wang Wang Supermarket, somewhere in northern China, where nerdy stockroom boy Li Junwei (new teen idol, singer Kimi Qiao Ren Liang) is on duty with -- and only has eyes for -- Tang Xiaolian (Lulu Li). But the quiet soon lapses into chaos when balding, pop-eyed He Sanshui (Xu Zheng) comes in with two doofus heavies (Zhao Yingjun, Wang Dongfang) and demands to speak to the mart's boss, Wang Sufen (Yang Qing).Turns out the boss -- who's actually off gambling -- was responsible for his inability to claim the prize on a winning lottery ticket, so he wants 9,500 yuan ($1,400) compensation. When Tang explains the boss isn't around, He & Co. tie Tang up and take over the joint, planning to sell goods until they reach that value. However, business is slow, and as a variety of characters come and go during the night, he turns more desperate. The arrivals of the boss and then a gun-toting robber (Zhang Jiayi) only make things worse.