Kim Hye-soo
Kim Jin-seo (Kim Hye-soo) is a psychiatrist out to uncover the truth behind the death of Sung Eun-pil (Kim Kap-soo). In doing so, Kim realizes that the deceased Sung's wife, Mo Yoon-hee (Hwang Shin-hye), may not only have been involved in Sung's death but that she has also been having an affair with Kim's husband, Lee Sang-hyun (Shin Sung-woo).