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This is-yeon Jin, how is such a wrinkle possible on your back? Han Hyo-joo has a back muscle to envy!

[스포츠조선 이정혁 기자]crazy muscle Han Hyo-joo seems to be curious.

Jin Seo-yeon recently posted a photo of herself exercising vigorously on her Instagram. The person filming behind the scenes appears to be Director Yang Chi-seung.

In particular, the back muscles are no joke, and they are enough to compete in female bodybuilder competitions.

Earlier, on the broadcast of ‘Radio Star’ on the 10th, actress Jin Seo-yeon surprised everyone by admitting, “I work out 4 hours a day with Yang Chi-seung, I work out with Girls’ Generation’s Sooyoung , Han Hyo-joo, and Seong-hoon.”

In addition, Seo-yeon Jin revealed an anecdote when her ‘exercise partner’, Hyo-joo Han, lightly squats with a kettlebell weighing 52 kg, which fueled her desire to compete.

Meanwhile, it is known that Han Hyo-joo and Jin Seo-yeon, who made a relationship through the movie ‘Banchangko’, maintain a close friendship and cultivate a special friendship. Reporter Lee Jeong-hyuk jjangga@sportschosun.com