Here are the 9 Korean stars from Twenty-Five Twenty-One (2022) who made the drama more alive and engaging:
1. Kim Hye-eun as Coach Yang
Born: March 1, 1973
TV Series: Encounter (2018), Doctor John (2019), Itaewon Class (2020), to name a few
2. Seo Jae-hee as Shin Jae-kyung

Born: May 15, 1976
TV Series: Run On (2020), Nevertheless (2021), You Are My Spring (2021), One Ordinary Day (2021), Artificial City (2021)
3. Lee Joo-myung as Ji Seung-wan
Born: December 1, 1993
TV Series: My Fellow Citizens (2019), Hospital Playlist, cameo (2020), Missing: The Other Side (2020), Kairos (2020), Check Out The Event (2021)
4. Choi Hyun-wook as Moon Ji-ung
Born: January 30, 2002
TV Series: Taxi Driver (2021), Racket Boys (2021), Jirisan (2021)
5. Choi Min-young as Baek Yi-hyun

Born: October 9, 2002
TV Series: Memory (2016), Entertainers (2016), Lucky Romance (2016), W (2016), Strong Woman Do Bong-soon (2017), Chicago Typewriter (2017), Queen For 7 Days (2017), Two Cops (2017), Radio Romance (2018), Mr. Sunshine (2018), Your Honor (2018), Confession (2019), Itaewon Class (2020), Dream Palace (2021) You Are My Spring (2021)
6. Choi Myung-bin as Kim Min-chae
Born: April 15, 2008
Films/TV Series: The Vanished (2018), 100 Days My Prince (2018), The King’s Affection (2021), Young Lady And Gentleman (2021-2022), to name a few
7. Bona as Ko Yu-rim
Born: August 19, 1995
TV Series: Hit The Top (2017), Girls’ Generation 1979 (2017), Your House Helper (2018), Homemade Love Story (2020-2021)
8. Kim Tae-ri as Na Hee-do
Born: April 24, 1990
Films/TV Series: The Handmaiden (2016), Little Forest (2018), Mr. Sunshine (2018), Space Sweepers (2021), to name a few
9. Nam Joo-hyuk as Baek Yi-jin
Born: February 22, 1994
Films/TV Series: Cheese In The Trap (2016), Moon Lovers: Scarlet Heart Ryeo (2016), Weightlifting Fairy Kim Bok-joo (2016), The Great Battle (2018), Start-Up (2020), to name a few