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One day, a woman (Lee Soo-yeon) goes to a police station and claims she's confessing to a murder. The more surprising this is, she claims to be his wife. The police goes to the scene of the crime and sees a man (Choi Joo-hyeok) stabbed to death. Her husband is a well-known entrepreneur but he is found miserably dead. Soo-yeon's story is shocking. Her husband was the Devil himself. He treated his wife as a sexual plaything and even dared to covet her sister (Lee Ji-yeon).

Unemployed Do Hwan (Park Won Bin) who lives off stock investments is suffering from a riddling noise ever since In Kyeong (Yuri Seo) moved in upstairs. He can't work or sleep and gets misunderstood by In Kyeong as a perverted psycho but he falls for her more and more. Hwa Jin, who has a crush on Do Hwan, finds out that In Kyeong is a medium and spreads the word. Do Hwan decides to help In Kyeong who is about to get kicked out. The two of them are drawn to each other and start an investment guide towards the apartment residents. However, when In Kyeong fails to make anymore predictions they are once again faced with a wall...