Eight years ago, a minor murder occurred in Nanhu Park in Hetun District. The deceased was a boy in the fourth grade of primary school. That day, he went to the park for a spring outing with his class. After the free activities, he disappeared and was found later that day. He had drowned in the artificial lake of Nanhu Park. After investigation, the police confirmed that the cause of death was indeed drowning, an accident caused by the boy accidentally falling into the lake while playing at the lake. But for such an ordinary case, a young policeman involved in the investigation raised questions...
