ONE: High School Heroes (2025) featured a cast of 14 tracked actors. Of these, 14 (100%) are still alive today. The oldest surviving cast member is Ha Mheen, age 57. This TV series starred Lee Jung-ha and Kim Do-wan.
100% still with us· verified cast
Survivorship
Cast Reunion Index: 100% still living
Cast14 members
| Person | Character | Status | DOB | Age | DOD | Age in 2025 |
|---|---|---|---|---|---|---|
 Lee Jung-ha Kim Eui-gyeom | Kim Eui-gyeom | Living | 23/02/1998 | 28 | — | 27 |
 Kim Do-wan Kang Yoon-ki | Kang Yoon-ki | Living | 08/03/1995 | 31 | — | 30 |
 Kim Sang-ho Kim Seok-tae | Kim Seok-tae | Living | 24/07/1970 | 56 | — | 55 |
 Kim Joo-ryoung Myeong Da-bin | Myeong Da-bin | Living | 15/07/1976 | 50 | — | 49 |
 Shin Jun-seop Nam Seung-Sik | Nam Seung-Sik | Living | 04/02/1998 | 28 | — | 27 |
 Lee Chan-hyeong Sung-Wook | Sung-Wook | Living | 03/11/1997 | 28 | — | 28 |
 Shin Jae-whi Lee Ki-Yoon | Lee Ki-Yoon | Living | 17/02/1994 | 32 | — | 31 |
 Lim Sung-kyun Kim Seung-joon | Kim Seung-joon | Living | 20/03/1996 | 30 | — | 29 |
 Yuk Jun-seo Lee Geol-jae | Lee Geol-jae | Living | 01/04/1996 | 30 | — | 29 |
 Yoo Hee-je Choi Ki-soo | Choi Ki-soo | Living | 10/07/1990 | 36 | — | 35 |
 Lim Hyun-tae Choi Hong-il | Choi Hong-il | Living | 18/03/1994 | 32 | — | 31 |
 Hong Min-gi Kim Nam-hyeop | Kim Nam-hyeop | Living | 12/03/2002 | 24 | — | 23 |
 Shin Hyun-soo Kim Su Gyeom [Eui Gyeom's brother] | Kim Su Gyeom [Eui Gyeom's brother] | Living | 08/07/1989 | 37 | — | 36 |
 Ha Mheen Kim Ui-gyeom Aunt (Eps 3) | Kim Ui-gyeom Aunt (Eps 3) | Living | 20/09/1969 | 57 | — | 56 |