Nobody Knows (2020) featured a cast of 25 tracked actors. Of these, 23 (92%) are still alive today and 2 have passed away. The oldest surviving cast member is Moon Sung-keun, age 73. This TV series starred Kim Seo-hyung and Ryu Deok-hwan.
92% still with us· verified cast
Survivorship
Cast Reunion Index: 92% still living
Avg. Age at Death: 27.5 yrs
Deaths by Year
2025
Cast25 members
| Person | Character | Status | DOB | Age | DOD | Age in 2020 |
|---|---|---|---|---|---|---|
 Kim Seo-hyung Cha Young-jin | Cha Young-jin | Living | 28/10/1973 | 52 | — | 47 |
 Ryu Deok-hwan Lee Sun-woo | Lee Sun-woo | Living | 12/06/1987 | 39 | — | 33 |
 Park Hoon Baek Sang-ho | Baek Sang-ho | Living | 27/04/1981 | 45 | — | 39 |
 Ahn Ji-ho Go Eun-ho | Go Eun-ho | Living | 05/01/2004 | 22 | — | 16 |
 Cho Han-chul Yoon Hee-seob | Yoon Hee-seob | Living | 13/05/1973 | 53 | — | 47 |
 Yoon Jae-yong Ha Min Sung | Ha Min Sung | Living | 03/04/2005 | 21 | — | 15 |
 Yoon Chan-young Ju Dong-myung | Ju Dong-myung | Living | 25/04/2001 | 25 | — | 19 |
 Seo Young-joo Kim Tae-hyung | Kim Tae-hyung | Living | 16/02/1998 | 28 | — | 22 |
 Shin Jae-whi Oh Du-seok | Oh Du-seok | Living | 17/02/1994 | 32 | — | 26 |
 Min Jin-woong Lee Jae-hong | Lee Jae-hong | Living | 22/08/1986 | 40 | — | 34 |
 Park Cheol-min Han Geun-man | Han Geun-man | Living | 18/01/1967 | 59 | — | 53 |
 Moon Sung-keun Hwang In-bum | Hwang In-bum | Living | 28/05/1953 | 73 | — | 67 |
 Baek Soo-jang Park Jin-su | Park Jin-su | Living | 23/12/1980 | 45 | — | 40 |
 Jang Young-nam Jung So-yun | Jung So-yun | Living | 25/11/1973 | 52 | — | 47 |
 Park Min-jung Bae Sun-a | Bae Sun-a | Living | 12/03/1982 | 44 | — | 38 |
 Tae Won-seok Ko Hee-dong | Ko Hee-dong | Living | 10/06/1989 | 37 | — | 31 |
 Jeon Seok-chan Kim Byung-hee | Kim Byung-hee | Living | 11/10/1981 | 44 | — | 39 |
 Kwon Hae-hyo Jang Gi-ho | Jang Gi-ho | Living | 06/11/1965 | 60 | — | 55 |
 Kang Seo-ha Yun Ja Yeong [Seoul police department] | Yun Ja Yeong [Seoul police department] | Deceased | 13/06/1994 | 31 | 13/07/2025 | 26 |
 Kim Sae-ron Cha Young Jin [Young] | Cha Young Jin [Young] | Deceased | 31/07/2000 | 24 | 16/02/2025 | 20 |
 Min Sung-wook Kevin Jung | Kevin Jung | Living | 22/09/1979 | 47 | — | 41 |
 Kang Shin-il Seo Sang Won | Seo Sang Won | Living | 26/11/1960 | 65 | — | 60 |
 Baek Jae-woo Baek Sang Ho [Young] | Baek Sang Ho [Young] | Living | 27/12/1998 | 27 | — | 22 |
 Jang Jae-ho Choi Dae Hoon [Ha Min Sung's chauffeur] | Choi Dae Hoon [Ha Min Sung's chauffeur] | Living | 08/01/1986 | 40 | — | 34 |
 Ha Mheen Jae-min Mother (Eps 1) | Jae-min Mother (Eps 1) | Living | 20/09/1969 | 57 | — | 51 |