JTBC's new weekend drama Good Boy, starring Park Bo-gum and Kim So-hyun, premiered on Saturday to mixed initial reactions, but a dramatic twist ending has quickly turned skepticism into buzz.

The first episode introduced viewers to a quirky fantasy world where a group of special-recruit former athletes join the police force.

While the story began with a slow-paced setup, it was the shocking final five minutes that had audiences hooked.

"Honestly, it's so cheesy and over-the-top ㅋㅋㅋ I know it's a drama, but what kind of fantasy 'special recruit cop' is this, like a superhero lol," one viewer wrote. "Oh, they nailed the ending."

Viewers took to online forums such as TheQoo and Pann to share mixed but intrigued reactions. "It was boring the whole time, but the last 5 minutes were funㅋㅋㅋ," another post read.

Others praised the shift in tone and the surprise twist that altered the show's trajectory.

"I really enjoyed the dramas Beyond Evil and Life on Mars, and turns out the same director and writer worked on Good Boy. No wonder it's exactly my taste—so funㅋㅋㅋ," one netizen commented.

The premiere stars Park Bo-gum as a former boxing champion-turned-enforcer in a secretive government program, alongside Kim So-hyun, Oh Jung-se, Lee Sang-yi, and Heo Sung-tae.

While early parts of the episode focused on character backstories and world-building, many fans now say the cliffhanger made the wait worthwhile.

"Kinda feels like a Disney setup. Super cool, super fun," one user noted.

Although the initial reception was divided, Good Boy appears to be gaining momentum, with growing online discussion and strong word of mouth.

Whether it leans further into action, mystery, or fantasy, fans agree that the drama has set the stage for an unpredictable ride.

Good Boy airs Saturdays and Sundays at 10:30 p.m. KST on JTBC.