In the emotionally charged teaser for Good Boy (2025), viewers are introduced to a gritty and gripping tale of love, loyalty, and survival. Park Bo Gum takes on the role of Ji-hoon, a former boxer-turned-bodyguard haunted by a violent past. When he is assigned to protect Seo-yeon (Kim So Hyun), a sharp and determined investigative journalist uncovering a high-level government scandal, their fates become dangerously intertwined.

The teaser opens with haunting cityscapes of Seoul and flashbacks of Ji-hoon’s brutal fights, setting a noir tone. Tension builds as Seo-yeon edges closer to the truth—putting both their lives at risk. Park Bo Gum brings brooding intensity, while Kim So Hyun’s performance radiates courage and vulnerability. Their chemistry is electric, hinting at both romance and tragedy.
Stylishly directed with pulse-pounding suspense and flashes of explosive action, Good Boy explores what it means to protect someone—even when redemption seems out of reach. As the screen fades to black, Ji-hoon whispers, “I’ll protect you… no matter what.”