Episode 1: 

Episode 2:

In episode 2, the action ramps up as the GOOD BOY crew continues to take down criminals, cleverly using their athletic backgrounds to gain the upper hand. Their success earns them positive media attention, which allows Man-sik to officially establish the Special Criminal Investigation Team, made up of the former medalist officers. Although the newly formed team struggles to find its footing, they begin pursuing a lead on the group responsible for the break-in at Han-na’s home. Meanwhile, Dong-ju is stunned when his close friend and former boxing teammate Lee Gyeong-il (Lee Jung-ha), confesses to a hit-and-run case Dong-ju has been investigating. Knowing Gyeong-il couldn’t have committed the crime, Dong-ju digs deeper and  discovers that customs officer Min Ju-yeong (Oh Jung-se) is the true mastermind behind it all.

Episode 3:

In this episode, we delve deeper into the backgrounds of some GOOD BOY team members, and witness just how ruthless Ju-yeong truly is. In a brutal move to cover his tracks, Ju-yeong orders a prison guard to kill Gyeong-il, silencing him for good. Dong-ju is heartbroken by his friend’s death and becomes even more determined to uncover the truth. His investigation leads him to a limited edition gold watch–worn by Ju-yeong and his criminal associates–that may be the key to unraveling the conspiracy. Han-na recognises the same watch from her late father, who died while investigating the Russian mafia. As Dong-ju and Han-na share their stories, a spark begins to form between them. In a heartfelt moment, Han-na returns Dong-ju’sgold medal, previously pawned in desperation, and urges him to bring the criminals to justice. Fueled by resolve, Dong-ju confronts Ju-yeong, warning him that he won’t get away.

Episode 4:

In Episode 4,the team sets their sights on a car smuggling ring, hoping it will lead them to the vehicle involved in the hit-and-run case. In a bold move, they use the police commissioner’s brand-new car as bait to draw out the smugglers. Successfully tracing them to a secret workshop, a massive brawl breaks out when the smugglers realise they’ve been set up. Amid the chaos, the ringleader is killed by his own men, cutting off a key lead. Still, the team uncovers evidence linking Ju-yeong to the smuggling operation. As the pressure mounts, Ju-yeong tries to make an escape under the guise of  a foreign business trip, leading to a high-stakes chase. While the team pursues him on the ground, Dong-ju takes to the rooftops, leaping across buildings in pursuit. Just as Ju-yeong is about to escape, Dong-ju makes a daring leap onto his vehicle, refusing to let him slip away.

Episode 5:

Episode 5 opens with a flashback to Dong-ju’s early days as an athlete, revealing the moment he first fell for Han-na during a training run. Back in the present, Dong-ju’s dramatic leap pays off, leading to Ju-yeong’s arrest and interrogation. However, the victory is short-lived–Ju-yeong is swiftly released after the chief prosecutor intervenes. With powerful allies shielding him, Ju-yeong appears invincible. But the GOOD BOY team refuses to back down. 

Shifting focus, the team begins investigating a dangerous synthetic drug linked to a mysterious figure known only as “Devil” (Lee Ho-jung). With her identity unknown, Devil cleverly poses as a helpless victim when Dong-ju rescues her from a fire. Captivated by her savior, she starts developing feelings for him. Meanwhile, Han-na is also coming to terms with her emotions. Realising her growing affection for Dong-ju, she surprises him with a kiss–setting the stage for a complicated love triangle. 

Episode 6:

Dong-ju is on cloud nine after Han-na’s kiss–but his joy is short-lived when he suddenly collapses and ends up in the hospital. Meanwhile, Devil offers a tip, which leads the team to the mastermind behind the counterfeit drug operation. This arrest uncovers just how deep Ju-yeon’s corruption runs–even the city’s mayor is revealed to be in his pocket. Furious that the mayor failed to keep things under wraps, Ju-yeong escalates his plans by stealing Man-sik’s gun through his henchmen, preparing for more chaos.

In a twist of fate, Man-sik’s daughter recognizes Devil from their shared flight and recalls her name from the boarding pass—Kim Yeon-ha. Han-na uses this clue to confirmDevil’s true identity through forensic evidence. While Man-sik is deeply worried for his daughter’s safety, the team manages to locate her unharmed. But the danger is far from over–seeking to hurt Dong-ju even more, Ju-yeong takes a cruel step further and shoots Gyeong-il’s mother.

Episode 7: 

Thankfully, Gyeong-il’s mother survives the shooting, though she remains unconscious. Fueled by rage, Dong-ju tracks down Ju-yeong and brutally beats him. Ju-yeong, however, uses footage of the altercation to demand the disbandment of the GOOD BOY team. As tensions rise, Man-sik fights to keep the team together. Facing suspension and public scrutiny, Dong-ju walks out of his disciplinary hearing–only to reveal he had struck a deal with Ju-yeong, offering himself up to be hit in exchange for leaving his team alone.

At the same time, Dong-ju’s doctor raises a serious concern: he may be suffering from  punch-drunk syndrome, the result of repeated head trauma from his boxing days. Despite this, Dong-ju remains resolute, refusing to back down. His determination pays off not only in his pursuit of justice but also in love –his growing bond with Han-na culminates in a heartfelt, genuine kiss, marking the official start of their relationship.

Episode 8:

The GOOD BOY team continues their undercover investigation into  Ju-yeong and realize that raw materials used in Devil’s drug production are being held at a port. Disguised as pest control workers, Dong-ju, Han-na, and Jong-hyeon head to the site to inspect the shipment. But they’re not the only ones after it–Devil and her crew arrive at the same time, hoping to seize the materials. While Devil manages to slip away, the team successfully secures the container. 

However, Ju-yeong isn’t backing down., He orchestrates an ambush to intercept the container while it’s being transported through  a tunnel to the evidence storage facility. As the transport begins, the GOOD BOY team is attacked at multiple points inside the tunnel. What follows is a chaotic sequence of car crashes, explosions and brutal confrontations. The episode ends in a gripping cliffhanger, leaving viewers uncertain about the team’s fate and what chaos still awaits in the tunnel.

Every episode of GOOD BOY delivers nonstop action, perfectly balanced with moments of comedy and romance. With justice still far from fully served, there’s plenty more drama and excitement ahead. Now that you’re caught up on the first eight episodes, don’t miss a moment–things are only heating up from here! Catch GOOD BOY exclusively on Prime Video, with new episodes dropping every  Saturday and Sunday.