Actor Yeo Jin Goo is gathering widespread notice for his prominently bulked-up physique, with new fan-bisected video capturing a dramatic change in his body.

The hype started when a fan X account shared a video with the caption, "Happy FM Day!!! #여진구 #YeoJinGoo."

In the video, Yeo waves hello to fans in a relaxed checkered top over a sleeveless black shirt, showing visibly wider shoulders and stronger arms.

READ MORE: Sung Dong Il Exposes Yeo Jin Goo's True Colors: 'Villain is His Real Personality'

Fans were quick to react to his new appearance. One fan pointed out, "Jin Goo looks fuller now," while another commented, "Even when he gains weight, he's still cute." Some other reactions were, "He's gotten chubbier," and "I almost didn't recognize him."

This is not the first time the actor's physique has been making waves. In July, Yeo showed up on TVING's The Great Escape: The Story with veteran entertainer Kang Ho Dong.

Audience members were shocked to find that Yeo looked even more muscular than Ho Dong, causing rampant buzz online.

In response to the commotion, Yeo provided some personal perspective. "I've always built muscle easily since I was young, and as I kept training, my body just grew," he said.

He continued, "Lately, I've been incorporating more cardio to tone down a bit. Honestly, I didn't even realize how big I had gotten myself."

When it comes to his comparison to Kang Ho Dong, he stated with a chuckle, "Standing next to Ho Dong, even I thought I looked too big. That's why I'm focusing on cardio these days to balance things out."

Yeo Jin Goo's changing image-from his cute boy face to a harder, more masculine presence-has captured the attention of fans and generated more public interest.

As he presses on with coming into his own, fans are interested in how it will shape his upcoming roles in television and film.

READ MORE: Yeo Jin Goo Recounts Middle School Experience Amidst 'Moon Embracing the Sun' Success