Li Weijie, his wife Ayu and their two daughters Pingping and An-an, are a Chinese family living in northern Thailand since last 17 years. Weijie run an internet service providing shop and is a film enthusiast who likes to watch detective films and has deep knowledge on the subject. They come from a middle-class family. One day, Pingping was keen to attend a summer camp and at the camp she met suchat, the son of a political candidate and police chief. At the summer camp, Pingping was violated by suchat and he then recorded the videos of him performing obscene acts in order to manipulate Pingping. Suchat had arranged for pingping to meet him at the family warehouse around 10pm, but upon reaching the warehouse he noticed that Ayu was there to intervene for pingping. Ayu and suchat had a scuffle and pingping accidentally killed suchat by hitting him with a spade. After being lost and confused in the pouring rain, Ayu and ping ping decided to bury the body and informed Weijie about the incident. Weijie was planning to shield his family from police conviction and in turn, he had to create an alibi for his whole family and train them to intensely to fabricate a perfect story coupled with convincing alibi. The story involved them going to watch a boxing match at hua lamphong in thailand on the 2nd and the 3rd of which weijie carefully orchestrated the time frame as well as training his family members to remember some key details.