Hyungsik updated fans on his back injury during ZE:A's comeback showcase for new mini-album 'First Homme' on June 3 at WAPOP Hall, Children's Grand Park.

He said, "The condition of my back has greatly improved.  I couldn't go to the recording of this ['Real Men'] broadcast because I was receiving treatment.  Then, I received treatment for one month straight and took part in the next training.  From hereon, please continue watching it a lot."

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He had previously suffered an injury to his back after falling during a training session on MBC variety program 'Real Men.'