Return (TV series)

• Go Hyun-jung/Park Jin-hee as Choi Ja-hye[5]

A lawyer who is now the host of a legal-themed TV show titled Return. She helps Na-Ra to solve In-ho's trial. She turns out to be the mastermind of Mi-jung's murder case as well as other sabotages against the socialites and Detective Dokgo.

• Lee Jin-wook as Dokgo Young

A hot-tempered detective. He has a sharp analytical to follow the trail of a murder case. Throughout the series, he manages to solve the murder cases, but is unable to capture the socialites throughout the years for their wrongdoings.

• Shin Sung-rok as Oh Tae-seok

A calm and successful CEO of an IT company, but turns to have shady behavior when he attempts to cover up a mistake he or Hak-Beom makes. He is currently being framed for murdering Ahn Hak-soo, a former police officer whom owns a karaoke bar.[6] After Tae Seok's and Hak Bum's secret is revealed, he plans to silence anyone who gets in his way, especially Attorney Choi.

• Bong Tae-gyu as Kim Hak-Beom

A professor in theology studies at Myungsung Foundation. He turns out to be an impulsive and abusive man who resorts to violence without thinking of its consequences. When things do not go on his ways, he tends to displace his anger onto other characters or bribe them with money in the show.

• Park Ki-woong as Kang In-ho

The chief director at Taeha Corporation. He was in a relationship with Mi-jung during their younger times. After marrying Na-ra, he had an adulterous affair with Mi-jung for one year and became the co-founder of Mi-jung's wine bar. When Mi-jung was found murdered, he was framed and put into prison. Despite being bribed by his wife, Na-ra, their marriage become more estrange and his attempts to save the marriage becomes futile due to his wife's discovery of his affair with Mi-jung. Throughout the series, he was the one whom knocked down a little girl when he was in high school. Unfortunately, he reluctantly followed Mi-jung's and the rest of his friends' suggestion to throw the girl into the sea.

• Jung Eun-chae as Geum Na-ra[7]

In-ho's wife and a former lawyer who passed her bar examination. Mi-jung describes her as an innocent, devoted and beautiful wife of In-ho. After Mi-jung was murdered, she discovered In-ho's affair. Currently, she has an estranged relationship with In-ho.

• Yoon Jong-hoon as Seo Jun-hee
  • Ji Min-hyuk as young Jun-hee

A doctor and an associate with Tae-Seok, Hak-Beom and In-Ho. Due to regrets and guilt he has gone through, he succumbed into drug addiction for years to forget the incident as well as stresses in workplace. When he witnessed Mi-jung's death and became his friends' accomplices, he decided to turn himself to the police. However, he was nearly murdered by both Tae-Seok and Hak-Beom. Despite running away from his mistakes and his friends, Na Ra managed to convince him to turn himself to the police, together with the evidences he had in the USB.

• Oh Dae-hwan as Kim Jung-soo

A doctor at The Daemyung Hospital.

• Kim Hee-jung as Kang Young-eun

Attorney Choi's assistant attorney. She is a very observant and calm character. She helps both Choi and Na Ra to find Joon Hee in a hospital in Taein.

• Kim Dong-young as Kim Dong-bae

A detective working with Dokgo Young. He saved Jun-hee from car crash. He turns out to have an alliance with Ja-hye to expose Taek So and the rest of the socialites' corruptions.

• Seo Hye-rin as Ko Seok-soon
• Son Jong-hak as An Hak-soo

A corrupted police, who used to be Detective Young's superior. He was the police-in-charge of the Sung Jung Mi's drowning case in 1999.

• Yoon Joo-hee as Park Jin-joo
• Shin Rin-ah as Kang Dal-rae

In-ho's and Na Ra's quiet and introverted daughter.

• Han Eun-jung as Yeom Mi-jung/Rachel Yeom (Ep. 1–2)

The victim of In-ho's case. She owned a wine bar, sponsored by In Ho. She had an affair with him for a year. After aborting his child, she planned to ruin In Ho's family by getting close to Na Ra.

• Park Jun-gyu as Park Byung-ho
• Shin Yoo-ram as a drug trafficker
• Jung Han-hun as Seo Joon-hee's father
• Kim Hyung-mok as Kim Byung-ki

A car salesperson, who was murdered by Tae Seok

• Kang Nam-gil as a judge
• Jo Seung-yeon as a prosecutor
• Hong Ji-yoon as Bang Seon-yeong

On February 7, 2018, it was reported that there was a large dispute on set of the series on the 5th, between lead actress Go Hyun-jung and the series' director Joo Dong-min.[10] The following day, Go's agency officially announced that the actress would be leaving the team due to irreconcilable differences with the directing team concerning the production process.[11][12][13][14] The agency also denied the initial reports that her sudden departure was due to her physically assaulting director Joo; stating that "there was indeed a verbal conflict but reports of physical assault was nonsensical".[15][16] Meanwhile, viewers of the series flooded SBS website with comments blaming the producer for "abusing his power" and calling for director Joo to quit instead.[17][18]

Actress Park Jin-hee later replaced Go Hyun-jung for the role of Choi Ja-hye. She started filming on February 13 and first appeared on the sixteenth episode.[5]