Kill Me, Heal Me

Kill Me, Heal Me is a 2015 South Korean television series starring Ji Sung, Hwang Jung-eum, Park Seo-joon, Oh Min-suk, and Kim Yoo-ri. It aired on MBC from January 7 to March 12, 2015 on Wednesdays and Thursdays at 21:55 (KST) for 20 episodes. The series incorporates dissociative identity disorder and child abuse elements as pivotal topics. It reunited Ji Sung and Hwang Jung-eum, who previously starred together in Secret Love (2013).

Synopsis
The human body is capable of all sorts of things to survive difficult situations. Cha Do-hyun (Ji Sung) is a third-generation business heir who developed dissociative identity disorder (previously known as multiple personality disorder) in the aftermath of several life-threatening traumatic events. He tries to regain control over his life with the help of Oh Ri-jin (Hwang Jung-eum), a beautiful first-year psychiatric resident who helps him secretly. But Ri-jin's twin brother, Oh Ri-on (Park Seo-joon), is a writer who is determined to uncover the unscrupulous lives of the rich and starts following Do-hyun around. Can Do-hyun take control over his condition before one of his seven identities takes control of him instead?

Main

 * Ji Sung as Cha Do-hyun (Cha Joon-young)
 * Lee Do-hyun as child Cha Do-hyun (Cha Joon-young)
 * A wealthy businessman with a warmhearted personality who loves to help others. He is the main personality of the body. However, after realizing that he suffers from dissociative identity disorder 11 years ago, he has been desperately trying to hide this fact from his families and friends. In Episode 17, it was revealed that Cha Joon-young is his real name. He has six other identities:


 * Shin Se-gi: A vehement young man with a devil-may-care demeanor who appears when Cha Do-hyun experiences violence. He may be violent, but he never hurts children and women. Se-gi endures all of Do-hyun's pain as he is the only identity to have all of Do-hyun's memories. His first love is Oh Ri-jin.


 * Perry Park: A 40-year-old man with an affinity for fishing and building bombs. He appears when Cha Do-hyun reminisces the sweetside of his father before they came back into the mansion. The name "Perry Park" came from the promise Do-hyun (Joon-young) made to his father, which is to buy a boat named Perry Park Boat for him. He speaks with a Jeolla dialect.


 * Ahn Yo-seob : A suicidal, intelligent 17-year-old boy who is an artist. He first appeared when Cha Do-hyun attempted to commit suicide when he was in high school. He is Yo-na's twin brother.


 * Ahn Yo-na : An extrovert and mischievous 17-year-old girl who loves idols. She appears when Cha Do-hyun undergoes a great deal of pain or mental stress, and needs to endure it clandestinely. She has a crush on Oh Ri-on. She is Yo-seob's twin sister.


 * Na-na (Cha Do-hyun): A 7-year-old girl who owns a teddy bear named Nana and revealed that her name is Cha Do-hyun. She is the embodiment of Do-hyun's childhood fears as well as Ri-jin's younger self.


 * Mr. X: A mysterious man who is later revealed as the father of Na-na.


 * Hwang Jung-eum as Oh Ri-jin (Cha Do-hyun)
 * Kim Amy as child Oh Ri-jin (Cha Do-hyun)
 * Oh Ri-on's twin sister. A first-year psychiatry resident who tries hard to maintain her seemingly perfect image to cover for her real personality. At first glance, she looks beautiful, elegant and gentle, but she is actually messy and short-tempered. Ri-jin then becomes Do-hyun's secret psychiatrist, and slowly falls in love with him. In Episode 16, it was revealed that Cha Do-hyun is her real name, and that she was adopted by Ri-on’s parents.


 * Park Seo-joon as Oh Ri-on (Omega / Oh Hwi)
 * Kim Ye-jun as child Oh Ri-on
 * Oh Ri-jin's twin older brother. Ri-on often gets mistaken as a goofball, but he is actually a famous mystery novelist under the pseudonym Omega who investigates about the Seungjin Family. His other name is Oh Hwi which he uses to flirt with girls.


 * Oh Min-suk as Cha Ki-joon
 * President of ID Entertainment, he is Do-hyun's confident and competent cousin. Ki-joon and Do-hyun are rivals, with both competing to inherit their family's company.


 * Kim Yoo-ri as Han Chae-yeon
 * She is Do-hyun's first love and Ki-joon's fiancée, a cold and prideful woman.

Supporting

 * Choi Won-young as Ahn Gook, Do-hyun's Secretary.
 * Ko Chang-seok as Suk Ho-pil (Dr. Schofield), Do-hyun's physician and Ri-jin's professor.

Seungjin Family
 * Kim Young-ae as Seo Tae-im, Chairwoman of Seungjin Group and Do-hyun's grandmother.
 * Shim Hye-jin as Shin Hwa-ran, Do-hyun's birth mother
 * Ahn Nae-sang as Cha Joon-pyo, Do-hyun's father
 * Kim Il-woo as Cha Young-pyo, President of Seungjin Group and Ki-joon's father.
 * Kim Na-woon as Yoon Ja-kyung, Ki-joon's mother
 * Myung Se-bin as Min Seo-yeon, Do-hyun's registered mother
 * Kim Yong-gun as Cha Gun-ho, First Chairman of Seungjin Group

Family of Ri-jin and Ri-on
 * Kim Hee-jung as Ji Soon-young, Ri-jin and Ri-on's mother
 * Park Jun-gyu as Oh Dae-oh, Ri-jin and Ri-on's father

Others
 * Kim Hyung-bum as Section Chief Choi
 * Go On as Alex Kang
 * Kim Hyun-joo as Baek Jin-sook, Chae-yeon's mother
 * Lee Si-eon as Chief Park Min-jae
 * Kang Bong-sung as Doctor Shin Sun-jo
 * Jo Chang-geun as Doctor Kang In-gyu
 * Choi Hyo-eun as Nurse Joo Mi-ro
 * Heo Ji-woong as Omega's editor

Special appearances

 * Yoon Joo as Jennifer
 * Jung Eun-pyo as U.S. psychiatrist who was afraid of Do-hyun (Ep. 1)
 * Kan Mi-youn as Shin Se-gi's girlfriend in the U.S. (Ep. 1)
 * Woo Hyun as Alcohol-dependent, mental patient (Ep. 1)
 * Koo Jun-yup as Club Paradise DJ (Ep. 1)
 * Kim Seul-gi as Patient Heo Sook-hee (Ep. 1–4)
 * Jo Yoon-ho as The biker with leather jacket (Ep. 1–3)
 * Seo Yi-ahn as Hong Ji-sun, Do-hyun's arranged date (Ep. 7)
 * LU:KUS as Idol group Rocking (Ep. 8)
 * Park Seul-gi as The MC (Ep. 8)
 * J.One (LU:KUS) as J.I. (Rocking) (Ep. 11–12)
 * Ahn Young-mi as Tarot card reader (Ep. 13)
 * Kwon Yu-ri as Ahn Yo-na (Ep. 20)

Casting

 * Lee Seung Gi was supposed to play the role of Cha Do-hyun, but declined. It was next offered to Hyun Bin, but he also declined.
 * Lim Ji-yeon was as well offered to become the female lead of the series but declined.

Remake

 * A Chinese remake titled A Seven-Faced Man aired on Tencent in 2017.
 * A Hong Kong remake titled Threesome aired on TVB in 2018.