Dog Bear (Kent Cheng) and Big Mouth (Wong Ching) raise hell in the traffic department. Their superior (Yang Kwan) has had enough of their antics, so they get demoted to the towing team. One day, fumbling through their work as usual, the two find a poor little girl left behind by her relative, and they have no choice but to take her in. The girl's aunt Mary (Elaine Jin) comes to bring her back to Canada, but Big Mouth is smitten as soon as he meets Mary...