One night, Ttol-ttol and Bok-nam, two classmates in elementary school, discover thieves ready to steal rice loads with their truck parked nearby. They hide in the rear side of the truck, and secretly stay in the thieves' cave. Ttol-ttol tells Bok-nam to report this to the police while he monitors their actions. Eventually the thieves find him and beat him, putting his life at risk. The police arrive just in time, thanks to Bok-nam's call, and the thieves are arrested. Ttol-ttol is saved. The two boys are awarded as good and brave children.