两个17岁的北京少年，马辉（崔林）和于岩（迟佳），共享一样的梦想：当警察！但是在报名警校时落榜，面临热闹亢奋的假夏生活。某天，他们的邻居、村民孙叔（傅彪） mysteriously broadcasts "internal information" to them, promising that capturing 100 petty thieves will grant special admission to the police academy. The boys' dormant hope reignites, and they start gathering tools for catching criminals while verifying the authenticity of this message. Despite not hearing anything from their mentor,警石亮叔叔（佟大为）， the duo meticulously plans out their strategy. During their pursuit of crime, they encounter numerous awkward situations and misunderstandings, yet they also experience the true, often mundane aspects of life.
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