放学路上,大宇遇到一个老头,求大字给他找丢失的小京巴乐乐。大宇实在不好拒绝,就和刘畅、李伦、赵勇展开了调查。在曾经丢失乐乐的菜市场上,大宇他们发现了一辆卡车,卡车的主人抱着一只叫欢欢的小狗,这只小狗很像乐乐。几个人追踪到了一个工厂,结果发现处处暗藏玄机,他们险些遭遇恶狗和神秘人的袭击。逃出险境的大宇、刘畅、李伦、赵勇,跟着段之冰进入一个洞,拉开一扇 On the way to school, Daewoo met an old man and asked him to find the missing small Gwanba Lele. Daewoo is really not good to refuse, and Liu Chang, Li Lun, Zhao Yong launched a survey. Daewoo they found a truck in the market where Lok Lok was once lost. The owner of the truck held a puppy named Huan Le. Several people traced to a factory, the results found hidden mystery everywhere, they almost suffered vicious attacks on dogs and mysterious people. Escape Daewoo, Liu Chang, Li Lun, Zhao Yong, along with the ice segment into a hole, opened a