AKMU's Chanhyuk was caught in the audience of popular singing competition program, the "National Singing Contest."

He made a surprise appearance in the episode of KBS 1TV's "National Singing Contest" which aired in the afternoon of October 16 not part of the line up but audience. As the camera swept the audiences watching the stage, Chanhyuk was caught quietly sitting in the crowd watching the stage intently–and it was an unusual styling that would catch one's eyes, with this red-rimmed shades and transparent mask. 

Fans and netizens reacted to his appearance in the audience of 3,000 people to be "interesting," "that's so funny." 

Meanwhile, Chanhyuk will be releasing his first solo full-length album 'ERROR' on the October 17. Stay tuned for more updates.