The One and Only () is a South Korean television series starring Ahn Eun-jin, Kim Kyung-nam, Kang Ye-won, and Park Soo-young. It premiered on JTBC on December 20, 2021, and aired every Monday and Tuesday at 23:00 (KST) till February 8, 2022. It is available for streaming on Netflix in Korea and selected territories.
Synopsis
The series tells the story of three women from very different backgrounds who have met in a hospice and decided to take down one bad person with the limited time they have left. Through unexpected events they become entangled in a murder case after meeting a mysterious hitman, and are faced with discovering 'one person' who is truly precious.
Cast
Main
Ahn Eun-jin as Pyo In-sook
A terminally ill woman who is so insensitive to life that she does not know what emotions to choose after being sentenced to death. Kim Kyung-nam as Min Woo-cheon Moon Seong-hyun as young Min Woo-cheon A mysterious hitman at the bottom of his life who gets entangled in a murder case with In-sook. Kang Ye-won as Kang Se-yeon A housewife who has led a responsible and ordinary life without being noticed by anyone. After being diagnosed with a terminal illness she begins to live her life for herself. Park Soo-young as Seong Mi-do A social media influencer who has been diagnosed with a terminal illness and is faced with an impending end to her glamorous life. Behind her bright exterior she hides an underlying loneliness.
Supporting
People around In-sook
Go Doo-shim as Yuk Seong-ja
In-sook's grandmother. Jang Hyun-sung as Pyo Kang-seon In-sook's father who left his daughter after a divorce. Seo Yeon-woo as Ha San-ah
Regional Investigation Unit
Do Sang-woo as Jo Shi-young
A detective from the Metropolitan Police Department of the Seoul Metropolitan Police Agency. Lee Bong-ryun as Hwang Ma-Jin Jang In-seop as Oh Jin-kyu, a detective.
People around Woo-cheon
Ahn Chang-hwan as Shin Tae-il
An ally to Min Woo-cheon who has a cautious personality and is a strong and cold-blooded killer. Choi Young-woo as Park Seung-sun
People around Se-yeon and Mi-do
Han Gyu-won as Oh Young-chan
Se-yeon's husband who runs his own business after marrying Se-yeon. He lives a stable life, however his life slowly begins to fall apart when his wife is diagnosed with a terminal illness and enters the hospice ward. Han Kyu-won as Gu Ji-pyo Mi-do's boyfriend who is a third-generation chaebol and the planning director of the Eunkang Group. He is a hot-headed person who communicates with the public through YouTube with a personality that is so easy-going that even his friends do not know that he is a chaebol. Yoon Bok-in as Hong Jang-mi
Morning Light
Lee Soo-mi as Magdalena
Yoon Bo-ra as Veronica
A nun for patients in hospice. So Hee-jung as Moon Young-ji A patient who has amyotrophic lateral sclerosis (ALS) disease Kim Soo-hyung as Lim Ji-hoo, Young-ji's child. Lee Hang-na as Choi Seong-hae Joo In-young as Cha Yeo-ul Sung Byung-suk as Oh Cheon-deok Oh Min-ae as Young-chan's mother Kim Byung-chun as Doctor Jo Kim Jeong-hwan as Kang Seo-gun Jang Seo-won as Jo Woong-do A drug offender who received a community service order from the hospice and has an optimistic personality.
Extended
Jeon Yi-soo as Ho-seon
The "best friend" of Seong Mi-do but beyond appearances they do not have a good relationship and are not close to each other. She attracts attention due to being an influential person. Baek Hyun-jin Lee Young-jin as Ji Yoon-seo, Kang Se-yeon's lawyer and classmate.
Production
Development
On October 18, 2021, KeyEast announced that it had signed a production supply contract with JTBC Studios for The One and Only at an undisclosed amount.
Casting
Park Sung-hoon was initially cast as Min Woo-cheon however he stepped down from the series on July 14, 2021, due to scheduling conflicts and personal reasons.
On October 25, 2021, it was reported that Kang Ye-won was in self-quarantine after contracting COVID-19 after performing a self-test while she was not scheduled for filming as part of the production recommendation. All personnel who had come in contact with her tested negative, with filming proceeding as scheduled.
On December 6, 2021, it was reported that a staff member had contracted COVID-19 on December 4, 2021, and filming was canceled the same day. Later the staff and actors all tested negative and filming continued as scheduled.