Good Boy is an action comedy about young athletes who become police officers through a special recruitment program. They exchange medals for police badges, and fight against a society full of corruption and injustice.
The film is directed by Shim Na Yeon, who is famous for The Good Bad Mother, The host, and written by Lee Dae Il, who wrote the script for Life on Mars, Chief of Staff. This combination promises to bring a work that reflects dramatic and attractive social reality.
Park Bo Gum plays Yoon Dong Joo - a former member of the national boxing team - becoming an enthusiastic young police officer.
In the new image of the character Dong Joo, Park Bo Gum appears with a mechanised and bloody appearance, a hand punch wrapped in ice and fierce eyes.
According to Allkpop, this role shows a completely different side of Park Bo Gum. The actor previously impressed with handsome roles, always meticulous and organized like in Reply 1988, Love in the Moonlight, Encounter, Record of Youth.
Most recently, Park Bo Gum received attention for his role as a coastal man who loves his wife, children and works hard in Netflix's "When Life Gives You Tangerines". Becoming IU's husband (as Ae Sun), Park Bo Gum was praised for many emotional scenes.
However, in Good Boy, the actor tried his hand at being a thorny police officer who refused to stand in front of wrongdoings.

To prepare for the role, Park Bo Gum spent more than 6 months on physical training. Reports say he has been practicing every day, spending 1 hour on strength training and 2 hours on fists.
The actor's dedication is clearly shown in the poster introducing the film with the impressive appearance of the character Yoon Dong Joo.
Park Bo Gum shared that he approached the role of Dong Joo as a person who did not calculate or think too much, but acted instinctively to protect those with a sincere, kind heart.
The production team praised Park Bo Gum's acting, as well as his careful preparation for this role. They promise to bring the audience an unprecedented image of Park Bo Gum.
Good Boy will premiere on May 31 on JTBC.