Good Boy Cast & Character Guide

The cast of Good Boy includes famous South Korean actors you’ve probably seen in other K-dramas. Directed by Shim Na-yeon, who is known for her work on Beyond Evil, Good Boy centers around ex-Olympic medalists and sports champions. After their careers come to an end, the athletes join the police force and help bring criminals to justice. Good Boy is the perfect example of why Korean TV shows have been receiving positive reviews from both domestic and international critics and audiences.

The series manages to blend humor with action in an effortless way, while also having emotional depth. But perhaps the best thing about the action-packed K-drama is how well the actors embody their characters. The main and supporting cast of Good Boy is absolutely remarkable, and they do an incredible job of bringing Lee Dae-il’s story to life. Everything in the TV show comes together nicely, from the show’s pacing to its intriguing premise, and it’s mostly thanks to the K-drama’s talented cast.

Park Bo-gum as Yoon Dong-ju

Date Of Birth: June 16, 1993

Actor: Born in Seoul, South Korea, Park Bo-gum starred in a variety of K-dramas in supporting roles before he made it big in the critically acclaimed Reply 1988. The actor is famous for appearing in Love in the Moonlight, where he played the lead role, Encounter, and Record of Youth. Recently, Park Bo-gum collaborated with IU on When Life Gives You Tangerines.

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Character: In Good Boy, Park Bo-gum takes on the role of Yoon Dong-ju, a former boxer turned police officer. Dong-ju is funny, a bit childish, and has a soft spot for Ji Han-na. He uses his boxing skills to help catch a notorious gang member.

Kim So-hyun as Ji Han-na

Date Of Birth: June 4, 1999

Actor: Kim So-hyun was born in Australia. In 2012, the actor had a career-changing role in the fantasy K-drama, Moon Embracing the Sun. She went on to star in River Where the Moon Rises, My Lovely Liar, and Love Alarm. The award-winning actor has also had roles in Guardian, While You Were Sleeping, and Bring It On, Ghost.

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Character: Like the rest of the main characters in Good Boy, Ji Han-na used to be a decorated athlete. She was a shooting champion whose career was unfortunately cut short. After she became a police officer, all she wanted was to be in the field, but her bosses thought she belonged behind the desk.

Oh Jung-se as Min Ju-yeong

Date Of Birth: February 26, 1977

Actor: Born in Uiryeong County, South Gyeongsang Province, South Korea, Oh Jung-se has had a long and impressive acting career. Although the actor has been on the acting scene for a while, it’s his role in the 2017 film, Fabricted City, that gained him critical and audience acclaim. Oh Jung-se is known for his roles in It’s Okay to Not Be Okay, When the Camellia Blooms, Sweet Home, and The Call.

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Character: Min Ju-yeong is a 7th-grade civil servant at the Korea Customs Service. Initially, it might seem like he is a good guy who loves his job, but there’s more to him than meets the eye.

Lee Sang-yi as Kim Jong-hyeon

Date Of Birth: November 27, 1991

Actor: Lee Sang-yi was born in Ansan, Gyeonggi, South Korea. Before he made it big in movies and TV shows, Lee Sang-yi was a stage actor. His TV breakthrough came after he starred in the 2020 series, Once Again. The actor is known for starring in Bloodhounds, Hometown Cha-Cha-Cha, When the Camellia Blooms, and My Demon.

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Character: Lee Sang-yi plays Kim Jong-hyeon in Good Boy. Jong-hyeon, a silver medalist fencer, used to date Han-na. He becomes a police officer to be closer to her, but ends up facing many challenges at work.

Heo Sung-tae as Ko Man-sik

Date Of Birth: October 20, 1977

Active Since: 2011

Actor: Born in Busan, South Korea, Heo Sung-tae made it big after starring in the historical K-drama, The Age of Shadows. The actor has had roles in Squid Game, where he played Jeong Dok-su, The Silent Sea, and Decoy. Heo Sung-tae’s other notable movies and TV shows include Behind Every Star, Big Bet, and Bloody Heart.

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Character: Ko Man-sik is a sort of mentor to Dong-ju as he is the one who taught him how to box. When the ex-wrestler fails to catch the gang member, the Golden Bunny, he is forced to partner up with Dong-ju to put the criminal behind bars.

Tae Won-seok as Shin Jae-hong

Date Of Birth: June 10, 1989

Actor: Tae Won-seok was born in South Korea. The actor nailed his role as Do Jin-woong in the 2018 K-drama, Player, which gained him recognition and put him on the map. Tae Won-seok has appeared in Bloodhounds, Sisyphus: The Myth, and Nobody Knows.

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Character: Rounding up the team of former athletes is Shin Jae-hong, played by Tae Won-seok. Jae-hong is kindhearted and isn’t as eager to be part of the special police force. However, he is still an important member of the team as his gentleness helps even out the loud personalities.

Good Boy Supporting Cast & Characters

Seo Hyun-chul as Hwang Gyeong-cheol: Seo Hyun-chul doesn’t have an extensive acting resume, but it’s nonetheless impressive. The actor has had roles in popular K-dramas and Korean movies such as Welcome to Samdalri, The First Responders, and The Gifted Hands.

Kang Gil-woo as Lee Sang-gon: Kang Gil-woo plays the leader of the Bunny Gang, Lee Sang-gon, in Good Boy. The actor is mostly recognized for his roles in My Dearest, Welcome to Samdalri, and Broker.

Jung Man-sik as Oh Jong-gu: The South Korean actor, Jung Man-sik, has had roles in a variety of movies and TV shows. He has starred in The Worst of Evil, Gangnam B-side, and Man to Man.

Seo Jeong-yeon as Jeong Mi-ja: Born on 30 November 1975, Seo Jeong-yeon has an impressive acting resume. Her notable K-dramas include Descendants of the Sun, My Demon, and Castaway Divas. She’s also appeared in the Korean film, Road to Boston.

Park Chul-min as Kim Geum-nam: With over 113 credits to his name, there’s probably a K-drama or Korean film you’ve seen Park Chul-min in. The actor has starred in the critically acclaimed Youth of May, The Villainess, and May 18.

Seo Jae-hee as Jin Gyeong-sook: Seo Jae-hee hasn’t appeared in a lot of K-dramas. But the ones she’s had roles in, including Nevertheless, The Kidnapping Day, and Twenty Five Twenty One, have been successful with both audiences and critics.