Joon-Sang (Hong Kyung-In) is a psychiatrist who runs his own clinic. He carries his own heavy psychological scars. His wife was raped and murdered in front of him. Since that moment, he has suffered from insomnia and deep sense of guilt and sadness.

One day, a beautiful woman, Ji-Soo (Kim Sun-Young), comes to his clinic. She tells him that all men that she loved have died and there is some kind of existence that is watching her.  

Meanwhile, a detective, who links Ji-Soo to a murder case, asks Joon-Sang for her medical records.

"It exists to protect me forever.
　　But people don't believe in it.”
　　The mental doctor 'Joon-sang' operates under the motto 'ease the heart and mind'. He meets a cool headed patient whose mind can't be cleared of any apparent wound. In the past his wife was raped and she committed suicide before his very eyes. Afterwards, he's unable to cleanse the crime and is troubled with sadness and insomnia as he tries to search out the fatal seductress patient 'Ji-soo'. When the love of their life dies, all men are protected by her from the temptation of 'Joon-sang'. And so, a petition is made to record the connection between the murder incident involving 'Ji-soo' and the current investigation by "Joon-sang"...
　　The unknown dangers of falling in love!