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Eun So-Yoo (Shin Go Eun) is a stylist. She struggles to make enough money to pay for her mother's operation fee. Due to a case, Eun So Yoo gets involved with Choi Seo Joon (Im Yoon Ho). He is rich and from a chaebol family but he also has an in incurable disease. Eun So Yoo pretends to love him for his money, but she falls truly in love with him. However, Choi Seo Joon is more interested in playing around than working and he doesn't believe in true love.

Tung's fiance Tat Ya passed away in an auto accident. Tung takes a vacation in Hong Kong to keep her mind off of the matter. In Hong Kong, Tung encounters Ka Bo, a man who looks exactly like Tat Ya. Ka Bo originally was a cop, but because of guilt over his girlfriend's suicide he chose an undercover assignment to keep himself numb. After their encounter, Tung's romantic persistence begins to melt Ka Bo's icy heart. Unfortunately, on a mission, Ka Bo falls into his superior officer's trap...

Kang Pil Sung (Song Sae Byeok) is a foul-mouthed but excellent detective. He is both lazy and rough and soft hearted. Hong Seo Jung (Koh Joon Hee) has excellent psychic mediumship, but she tries to hide her ability. In order to do that, she keep distance from other people and lives a lonely life. Possessed is about an absolute crime that interferes with the natural order of things by calling the soul of a serial killer executed 20 years ago, and by invoking the soul of a detective who initially catches a serial killer, to end the history of this crime.