March 26, 1991, Daegu, South Korea. Five boys studying in Chengxi Primary School went up the mountain together and never came back. The incident caused an uproar. Although the police dispatched tens of thousands of search personnel, they found nothing, and the whereabouts of the children became a mystery that could not be solved. One day four years later, Jiang Zhisheng, a television producer with boundless scenery, was exiled by his headquarters to remote Daegu on suspicion of fraud. Arrogant and arrogant, he found that local people were still concerned about the "disappearance of a young frog" that had been forgotten by many people. In order to make an early comeback, Jiang Zhisheng joined hands with Professor Huang, who has been paying close attention to the case, and the case that has been sick for many years seems to have taken a new turn. The film is adapted from a real case in Daegu, South Korea, in 1991, which is known as the "missing frog teenager" and is one of the three major unsolved mysteries in South Korea. The body of the missing teenager was found in 2002. Two other cases have been filmed as "memories" and "the Voice of that guy".
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