Lost () is a 2021 South Korean television series starring Jeon Do-yeon, Ryu Jun-yeol, Park Byung-eun and Kim Hyo-jin. Labelled as "JTBC's Tenth Anniversary Special Project", it aired from September 4 to October 24, 2021 every Saturday and Sunday at 22:30 (KST). It is also available for streaming on iQIYI.

Synopsis It tells the story of ordinary people who have worked hard all their lives to see the spotlight, but have to face the reality that "nothing has happened" while realizing they are now in the middle of the downhill road of life.

Cast Main Jeon Do-yeon as Bu-jeong, a ghostwriter who wants to write an original work in her own name. She has tried her best in life, but suddenly encounters a failure and loses reason to live. Ryu Jun-yeol as Kang-jae, a man facing the end of his youth who is afraid of "being nothing". He grew up poor and dreams to become rich. He runs a service company that organizes people to take on different roles required by clients. Park Byung-eun as Jung-soo, Bu-jeong's husband who is a food store management team leader in a department store. Kim Hyo-jin as Kyung-eun, Jung-soo's first love.

Supporting People around Bu-jeong Park In-hwan as Chang-suk, Bu-jeong's father. Shin Shin-ae as Min-ja, Jung-soo's mother. Park Ji-young as Ah-ran, an actress and a best-selling author.

People around Kang-jae Yoo Su-bin as Tak / Sun-joo (real name), Kang-jae's best friend. Son Na-eun as Min-jung, Kang-jae's friend who is a former idol trainee. Jo Eun-ji as Sun-gyu, a pharmacist. Yang Dong-geun as Woo-nam, a nurse in the intensive care unit. Kang Ji-eun as Mi-sun, Kang-jae's mother. Lee Seo-hwan as Jang-gyu, Mi-sun's housemate. Ryu Ji-hun as Jong-hun, host team leader. Na Hyun-woo as Jung-woo, a host.

Others Oh Kwang-rok as Jin-seop, an actor. Lee Se-na as Ji-na, Jin-seop's lover. Kang Hyung-suk as Jun-hyuk, Jung-soo's co-worker.

Production Lost is the first-ever television project of film director Hur Jin-ho. It also marks lead stars Jeon Do-yeon and Ryu Jun-yeol's small screen comeback after five years.

It was reported that the first script reading of the cast was held on January 6, 2021.

Viewership

+ Average TV viewership ratings Original broadcast date Average audience share(Nielsen Korea) Nationwide Seoul 1 September 4, 2021 2 September 5, 2021 3.752% 4.023% 3 September 11, 2021 3.308% 3.531% 4 September 12, 2021 2.784% 3.472% 5 September 18, 2021 1.696% 6 September 19, 2021 2.269% 2.729% 7 September 25, 2021 1.356% 8 September 26, 2021 2.101% 9 October 2, 2021 1.168% rowspan=7 10 October 3, 2021 1.904% 11 October 9, 2021 12 October 10, 2021 1.848% 13 October 16, 2021 1.656% 14 October 17, 2021 1.642% 15 October 23, 2021 1.210% 16 October 24, 2021 2.435% 2.631% Average In the table above, the represent the lowest ratings and the represent the highest ratings. N/A denotes that the rating/ranking is not known. This series aired on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).

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