Room No. 9

Room No. 9 is a 2018 South Korean television series starring Kim Hee-sun, Kim Hae-sook and Kim Young-kwang. It aired on tvN from October 6 to November 25, 2018, every Saturday and Sunday at 21:00 (KST).

Synopsis
The story of two women whose fate is switched as they exchange bodies, and a man who holds the key to that fate.

Main

 * Kim Hee-sun as Eulji Hae-yi, a beautiful but manipulative lawyer who has a 100 percent success rate in court.
 * Kim Hae-sook as Jang Hwa-sa, a death-row convict who is the infamous killer behind a poison murder case.
 * Kim Young-kwang as Gi Yoo-jin / young (real) Gi San, Hae-yi's boyfriend who is a family doctor. He seems to be smart and gentle but he hides an inner dark side.

Supporting

 * Lee Geung-young as Gi San, Yoo-jin's half-brother who hides a secret from his past.
 * Oh Dae-hwan as Oh Bong-sam, an investigator.
 * Kim Si-eun as Kim Hye-sun
 * Jung Jae-won as Gi Chang-sung, Gi San's son who lives a lawless lifestyle.
 * Kim Jae-hwa as Kam Mi-ran
 * Jung Won-jong as Ma Hyun-chul
 * Im Won-hee as Bang Sang-soo
 * Jung Yeon-joo as Han Hyun-hee
 * Kang Shin-il as Eulji Sung
 * Son Sook as Jang Hwa-sa's mother
 * Son Byong-ho as Kim Jong-soo
 * Min Sung-wook as So Young-chul

Special appearance

 * Yoon Park as Chu Young-bae
 * Song Yoon-ah as Park Hyun-jung