K-Drama ‘24-Hour Gym’ Flexes Star-Studded Cameos and Heartwarming Stories

Currently airing every Wednesday and Thursday at 9:50 PM on KBS 2TV, the fitness-themed K-drama ‘24-Hour Gym’ (directed by Park Junsu and Choi Yeonsu, written by Kim Jisoo, and produced by CJ ENM Studios, Beonfactory, Monster Union, and KEYEAST) continues to win viewers with its light comedic tone and strong physical narratives.

Set in a gym not just for physical gains, but as a sanctuary for self-discovery and emotional healing, the drama stars Lee Jun-young as Do Hyun-jung, a passionate yet quirky gym manager, and Jung Eun-ji as Im Mi-ran, a fitness newcomer. Together, they create a narrative filled with laugh-out-loud moments that mirror real-life gym episodes, resonating with audiences across Korea and abroad.

One of the winning formulas of ’24-Hour Gym’ is its dazzling lineup of special guests, including actors and real-life athletes, who elevate each episode with authenticity and flair. Notable among them is veteran actor Choi Moo-sung, who plays Dong Han-chul, the original gym founder who once changed Hyun-jung’s life trajectory, inspiring him from a ridiculed orphan to a world championship athlete.

Singer-songwriter Jo Jung-chi also made a memorable appearance in Episode 3 as Cheol-nam, a member of the ‘Skinny Man Fighting’ community. His portrayal of a frail man regaining confidence and health through fitness left viewers moved. Jo also served as the drama’s music director, impressing fans with perfectly placed emotional tracks. A scene where Cheol-nam recalls his life mid-workout stood out, featuring a vocal performance by his real-life wife and singer Jung-in, adding a touch of heartfelt reality.

The drama also featured celebrity gym cameos from Yoon Sung-bin, a former national skeleton racer; Yang Chi-seung, a famed personal trainer; Jung Dae-jin, an international bodybuilding star; and Kim Jun-hyun, a comedian known for his foodie persona. These surprise appearances reflect the show’s rich tapestry of ‘real’ gym-goer stories, making every episode a mix of humor, muscle, and inspiration.

The production team stated, “We sincerely thank all our celebrity guests who made time in their busy schedules. Their performances have added depth and authenticity to this project. More special appearances are planned in upcoming episodes—stay tuned!”

The fifth episode of ’24-Hour Gym’ airs on KBS 2TV this Wednesday, June 14th at 9:50 PM.