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.