One Ordinary Day

One Ordinary Day is a 2021 South Korean web series starring Kim Soo-hyun and Cha Seung-won. It is based on the British television series Criminal Justice written by Peter Moffat. It premiered on Coupang Play in South Korea on November 27, 2021. It is streaming exclusively through Viu outside South Korea.

Synopsis
On a day no different from any other, a straight-A university student Kim Hyun-soo (Kim Soo-hyun) makes the mistake of his life. Just as any other college kid would, Hyun-soo is on his way to hang out with his friends. Late at night, he takes his father's taxi to head over to where his friends are. Hong Gook-hwa (Hwang Se-on), a sad-looking mysterious girl mistakes Hyun-soo's taxi for an on-duty cab and hops in. That was the beginning of everything. All the choices Hyun-soo made that night leads the normal university student to becoming the prime suspect in a violent murder case. While Hyun-soo shivers from fear and the fact that he is falsely accused, everyone still points to him as the only possible murderer. In this hopeless situation, those who stretch out a helping hand are a low-life attorney, Shin Joong-han (Cha Seung-won), and a criminal kingpin who rules the prison food chain, Do Ji-tae (Kim Sung-kyu). To prove his innocence in any way possible, Hyun-soo gives everything he has to fight against the police and the Korean prosecution.

Main

 * Kim Soo-hyun as Kim Hyun-soo
 * A normal college student whose life turns upside down when he unexpectedly becomes the key suspect of the murder case.


 * Cha Seung-won as Shin Joong-han
 * A lawyer who barely passed the bar exam and the only person who reaches out to help Kim Hyun-soo.


 * Kim Sung-kyu as Do Ji-tae
 * A violent criminal who has been serving a prison sentence for 10 years and has control over the prison.

Supporting

 * Kim Hong-pa as Park Sang-beom, the head of the detective department working on Hyun-soo's case
 * Kim Shin-rok as Ahn Tae-hee, a prosecutor working on Hyun-soo's case
 * Yang Kyung-won as Park Doo-sik
 * Lee Seol as Seo Soo-jin, a rookie lawyer who follows Hyun-soo's case
 * Jung Ji-ho, a National Forensic Service (NFS) staff
 * Kim Young-ah as Hong Jeong-ah, a NFS staff
 * Moon Ye-won as Kang Da-kyung, a journalist who investigates Hyun-soo's case to write exclusive articles

Others

 * Hwang Se-on as Hong Gook-hwa
 * Kim Yoo-jung as Joong-han's new client (cameo)

Production
On January 5, 2021, it was announced that The Studio M, Chorokbaem Media and Gold Medalist would co-produce a television series based on the British Broadcasting Corporation (BBC) crime series Criminal Justice. BBC Studios confirmed the adaptation on January 13, through its media centre. Kim Soo-hyun and Cha Seung-won stars in leading roles, Kwon Soon-kyu wrote the screenplay, and Lee Myung-woo directed the series. Filming began in the first half of 2021. It is Coupang Play's first original series with exclusive broadcast rights in South Korea.