Kill Me, Heal Me

Han Chae-yeon

Shin Hwa-ran, Do-hyun's birth mother

Suk Ho-pil (Dr. Schofield), Do-hyun's physician and Ri-jin's professor.

Jennifer

Patient Heo Sook-hee (Ep. 1–4)

Alex Kang

Cha Gun-ho, First Chairman of Seungjin Group

Shin Se-gi's girlfriend in the U.S. (Ep. 1)

Cha Young-pyo, President of Seungjin Group and Ki-joon's father.

Club Paradise DJ (Ep. 1)

Baek Jin-sook, Chae-yeon's mother

Yoon Ja-kyung, Ki-joon's mother

Ji Soon-young, Ri-jin and Ri-on's mother

Min Seo-yeon, Do-hyun's registered mother

Oh Ri-jin (Cha Do-hyun) Kim Amy as child Oh Ri-jin (Cha Do-hyun)

Cha Ki-joon

Cha Do-hyun (Cha Joon-young) Lee Do-hyun as child Cha Do-hyun (Cha Joon-young)

Cha Joon-pyo, Do-hyun's father

Tarot card reader (Ep. 13)

Seo Tae-im, Chairwoman of Seungjin Group and Do-hyun's grandmother.

Oh Ri-on (Omega / Oh Hwi) Kim Ye-jun as child Oh Ri-on

Nurse Joo Mi-ro

U.S. psychiatrist who was afraid of Do-hyun (Ep. 1)

Chief Park Min-jae