From Olympic medallists to rookie cops, Park Bo-gum leads a star-studded cast in a gritty new K-drama packed with action, heart and humour
Park Bo-gum is back—and this time, he’s swapping his signature romantic charm for gritty action sequences. In Good Boy, he plays Yoon Dong-ju, a former Olympic gold medallist who joins a team of fellow ex-athletes-turned-cops tasked with fighting crime. Alongside a strong ensemble cast including Kim So-hyun, Lee Sang-yi, Tae Won-seok and Heo Seong-tae, Good Boy offers a mix of edgy action, heartfelt moments and plenty of laughs. Here are six reasons why this K-drama deserves a spot on your watchlist.
Also read: 7 memorable roles played by Park Bo-gum in dramas and films
Park Bo-gum like you’ve never seen him before

Above Park Bo-gum is a ‘Good Boy’ in his latest K-drama. (Photo: JTBC)
After his Baeksang-nominated turn as Gwan-sik, the loving and devoted husband in When Life Gives You Tangerines, Park Bo-gum is back in a brand-new K-drama as Yoon Dong-ju, a scrappy boxer with unwavering morals. He may not be the sharpest tool in the shed, but he makes up for it with a killer right hook—and a big heart.
This is Park Bo-gum in full action mode: he gives as good as he gets, throwing and receiving punches. He’s bruised, battered and bloodied. It’s a gritty, physically demanding role that marks a striking departure from his usual clean-cut, romantic lead.
See also: 5 life lessons from ‘When Life Gives You Tangerines’
Dong-ju’s cute little crush on Ji Han-na

Above Park Bo-gum will have you rooting for him to win Kim So-hyun’s heart. (Photo: JTBC)
Yoon Dong-ju has it bad for Ji Han-na (played by Kim So-hyun), and he doesn’t even bother hiding it. Park Bo-gum leans into his signature puppy-dog eyes to full effect, bringing a boyish sincerity to his affections that’s hard to resist. Their chemistry is sweet and earnest, and you can’t help but root for him to get the girl.
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The champions-turned-crimefighters plot

Above An ace with the rifle (Photo: JTBC)
In Good Boy, former Olympians, stripped of the spotlight but not their fighting spirit, now channel their elite training into tackling street-level crime, with mixed, and often hilarious, results. From medallists to rookie cops, they segue into careers in the police force, trading podiums for patrols as they find new purpose.
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The stylised action sequences

Above Lee Sang-yi’s perfect fencer’s form (Photo: JTBC)
Their Olympic past gives each character a signature fighting style. Park Bo-gum’s Yoon Dong-ju, a former middleweight boxing gold medallist, throws knockout punches with raw intensity. Kim So-hyun’s Ji Han-na, an air rifle gold medallist, is an ace with a gun.
Lee Sang-yi’s Kim Jong-hyeon, a silver-medal sabre fencer, delivers precise strikes with a stick, all while maintaining flawless fencer’s form. Tae Won-seok’s Shin Jae-hong, a bronze medallist in discus, hurls manhole covers with ease and precision. And Heo Seong-tae’s Go Man-sik, a Greco-Roman wrestling bronze medallist and the head of their team, dominates close combat with brute strength and expert grappling.
Strong ensemble cast chemistry

Above Big bear energy (Photo: JTBC)
Even early on, it’s clear that the cast’s chemistry is one of the K-drama’s biggest strengths, infusing each scene with warmth, humour and heart. Beyond Park Bo-gum and Kim So-hyun’s adorable romantic tension, there’s the compelling mentor-mentee bond between Heo Seong-tae and Park Bo-gum, a simmering rivalry with Lee Sang-yi and the easy, brotherly energy Tae Won-seok brings to the mix. Together, they form a lovable group of misfits whose chaotic charm makes them endlessly watchable.
The familiar faces

Above Lee Jung-ha from ‘Moving’ stars as Park Bo-gum’s close friend in ‘Good Boy’. (screencap from ‘Good Boy’, Prime Video)
Beyond the main cast, Good Boy treats fans to a few delightful cameos and supporting roles. Moving’s Lee Jung-ha appears as Dong-ju’s loyal friend, Lee Gyeong-il, while Alchemy of Souls’ scene-stealer Yoo In-soo takes on the role of the Golden Bunny Gang’s Bagboy. Sharp-eyed viewers may also spot Choi Woo-jin, last seen in a memorable turn in When the Phone Rings. And in a delicious twist, It’s Okay to Not Be Okay’s Oh Jung-se plays the drama’s formidable big bad.
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