Review:
Zhang Dongsheng, a teacher, arranges what he thinks is the perfect murder. Acting like a dutiful son-in-law, he takes his wife's parents to a nature park at a time when it's mostly deserted and pushes them off the mountain to their deaths. He'll claim it's an accident caused by his father-in-law's health condition, and since there are no witnesses, no one will be the wiser.
However, there are witnesses: three children who accidentally catch the whole thing on video. Thirteen-year-old Chaoyang and his new friends, two runaway orphans named Ding Hao and Pupu, initially think they should turn the footage in to the police. However, if they do that then Ding Hao and Pupu will be forced to go back to the orphanage where they were mistreated and nine-year-old Pupu was sexually abused. Chaoyang had briefly been letting the two orphans stay at his house while his mother was away at work, but the situation can't continue, so the kids hatch a plan to blackmail Zhang Dongsheng, who they believe must be rich because of the kind of car he drives (his wife and in-laws were rich, not him). They'll use the money they get from him to pay for food and a place to stay.
As the situation becomes more complicated, both Zhang Dongsheng and the kids have things to hide.
