Diary of a Prosecutor Cast , featuring Lee Sun-kyun, Jung Ryeo-won, and a talented ensemble portraying the realistic lives of everyday prosecutors in this acclaimed Korean legal drama.
Table of Contents
Introduction
Diary of a Prosecutor offers a refreshing take on the legal drama genre, focusing not on sensational courtroom battles, but on the quiet, often humorous and relatable lives of everyday prosecutors. Set in a small town, the series explores the mundane yet meaningful moments of civil servants working within South Korea’s legal system. One of the show’s greatest strengths lies in its talented ensemble cast, led by Lee Sun-kyun and Jung Ryeo-won, who deliver nuanced, down-to-earth performances. With sharp writing and a cast that fully inhabits their roles, Diary of a Prosecutor stands out as a realistic and character-driven K-drama that resonates with viewers looking for authenticity and depth.
Diary of a Prosecutor Cast
Lee Sun-kyun as Lee Sun-woong
Lee Sun-kyun plays the laid-back and observant prosecutor Lee Sun-woong. He works in the fictional town of Jinyoung and has a deep understanding of people, which helps him navigate cases in unconventional ways. Lee brings his signature calm, charismatic presence to the role, grounding the drama in warmth and authenticity. Known for roles in My Mister and Parasite, Lee Sun-kyun excels at portraying emotionally layered characters.
Jung Ryeo-won as Cha Myung-joo
Jung Ryeo-won plays Cha Myung-joo, a highly competent and career-focused prosecutor who gets transferred from Seoul to Jinyoung under unexpected circumstances. Her character is smart, sharp-tongued, and struggles to adjust to the slower pace and less structured working style of the local team. Jung’s performance balances ambition with vulnerability, showing the internal conflict of someone trying to redefine success.
Lee Sung-jae as Jo Min-ho
Jo Min-ho is the chief prosecutor of the Jinyoung office, constantly juggling team dynamics, office politics, and difficult casework. Lee Sung-jae plays the role with nuance, often caught between ambition and practicality. His character adds a layer of realism to the workplace setting.
Jeon Sung-woo as Hong Jong-hak
The youngest prosecutor in the office, Hong Jong-hak is naive, earnest, and occasionally overwhelmed. Jeon Sung-woo’s portrayal adds humor and charm, making Jong-hak one of the most relatable characters, especially for younger viewers starting out in their careers.
Kim Kwang-kyu as Oh Yoon-jin
A senior prosecutor who’s more interested in convenience than ambition, Oh Yoon-jin provides comic relief with his easygoing approach to work.
Baek Hyun-joo as Jang Man-ok
Baek Hyun-joo delivers a strong performance as the backbone of the team, juggling paperwork, people, and problems with equal tenacity.
Supporting Cast
Ahn Eun-jin as Sung Mi-ran
Sung Mi-ran is an assistant officer at the prosecutor’s office, known for her bright personality and dedication. Ahn Eun-jin brings warmth and liveliness to the role, and though her character isn’t always front and center, she adds heart and relatability to the office dynamics.
Baek Hyun-joo as Jang Man-ok
A veteran of the office, Man-ok is the head administrative officer who knows the inner workings of the department better than anyone. Baek Hyun-joo gives the character depth, playing her as stern but fair, with a deep commitment to her work and coworkers.
Kim Yeo-jin as Sun-woong’s Mother (Special Appearance)
Though not a major character, her appearance adds emotional weight to Sun-woong’s backstory, helping viewers understand more about his motivations and personal history.
Conclusion
Diary of a Prosecutor stands out not with high-stakes legal battles or flashy plot twists, but through its grounded storytelling and richly developed characters. The strength of the series lies in its exceptional cast — from leads like Lee Sun-kyun and Jung Ryeo-won to the ensemble of supporting actors who bring depth, humor, and realism to every scene. Together, they paint an authentic portrait of ordinary professionals navigating the challenges of public service. It’s this human touch, combined with smart writing and believable performances, that has earned Diary of a Prosecutor its loyal following. For anyone looking to experience a legal drama with heart, nuance, and genuine relatability, the cast of this series delivers on every level.
Reply 1988 Cast & Their Role 2015 Kdrama
FAQs
What is Lee Sun-kyun best known for besides this drama?
Lee Sun-kyun is widely recognized for his roles in My Mister, Pasta, and the Oscar-winning film Parasite, where he played the wealthy father, Mr. Park.
Has Jung Ryeo-won acted in other legal dramas?
Yes, Jung Ryeo-won starred in Witch’s Court, where she also played a prosecutor. Her ability to balance strong female leads with emotional vulnerability has been praised across multiple roles.
Are any of the supporting cast members rising stars?
Yes. Ahn Eun-jin, who plays Sung Mi-ran, has gained increasing attention with her roles in Hospital Playlist and The Good Bad Mother.
Is there any off-screen chemistry or reunions among the cast?
While the cast hasn’t officially reunited onscreen, interviews and behind-the-scenes clips reveal a friendly and collaborative atmosphere during filming. Several actors have spoken about the realistic, ensemble-focused nature of the production.
Did Lee Sun-kyun and Jung Ryeo-won work together before this drama?
No, Diary of a Prosecutor was their first project together. Despite this, their on-screen chemistry as contrasting colleagues was highly praised for its subtlety and realism.
Did the actors receive legal training or consultation for their roles?
Yes, to add authenticity, the cast reportedly received guidance from real prosecutors and legal consultants. This helped them portray procedural accuracy and the often mundane but meaningful nature of legal work.
Which cast member provided comic relief in the series?
Kim Kwang-kyu (as Oh Yoon-jin) and Lee Dong-hwi (guesting briefly) brought comedic moments to the series. Their deadpan humor and timing gave balance to the otherwise realistic tone of the show.
Has any cast member won awards for their role in Diary of a Prosecutor?
While Diary of a Prosecutor was more of a critical favorite than a sweeping awards show winner, Lee Sun-kyun and Jung Ryeo-won were praised by critics and audiences alike for their performances. The series received nominations at the Baeksang Arts Awards and Korea Drama Awards.