2AM balladeer Jo Kwon may have a penchant for girl dances when appearing on variety shows but there's no denying his manliness based purely on physique.

Jo Kwon showed off his ripped upper body on Instagram, uploading a photo after a gym workout which highlighted his six-pack abs and bulging shouder and arm muscles.

Jo Kwon said on Instagram that it was his day off so he took the chance to train in the gym, a routine which has obviously done wonders for his fitness.

Fans congratulated the idol for working hard to achieve an impressive-looking body.

"Wow a 6 pack," "So sexy," "*fanning self* Kwonnie-Oppa! <3," said fans on Instagram.

Aside from his ripped physique, Jo Kwon surprised fans with what looks to be a chest tattoo scribbled across his chest just below his collar bones. The photo was shot with dim lighting, so viewers could not decipher the tattoo.

"When did you get a tat?" asked one curious fan.

Jo Kwon is currently starring in the Korean stage run of Chess, which revolves around chess grandmaster Anatoly Karpov and his intense championship match against American Freddie Trumper during the politically charged Cold War era.

Jo Kwon shares the leading role in Chess with three other K-Pop idols, namely, SHINee's Key, VIXX's Ken and B1A4's CNU, with the four taking turns performing at different dates.

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Mickey is a writer and digital content creator based in Manila. He is a co-founder of ZAVI App and editor of the small business blog IndieMickey. He has also been bitten by the K-pop fashion bug - catch his outfitgrids on Instagram @mickjami.