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A man hatches up an elaborate murder plot to kill his cheating wife and her family after she demands a divorce. His actions are recorded by three children playing nearby, yet he soon discovers that he was actually set up by the three young children. He then set to find out how and why a thirteen-year-old boy is able to twist the truth to his advantage.

Mi-Kyung runs a small hair salon. Her son Ik-Soo is preparing for the bar exam and is staying at an apartment for bar exam students. Mi-Kyung learns from her son that he has received a 1.2 million won ($1,100 USD) water bill. She is stunned and decides to go to the apartment complex to find out more details. There, Mi-Kyung senses that something isn't quite right and begins to investigate.