If you’re a fan of “K-pop Demon Hunters” or a K-pop fan in general, you’re likely already familiar with the singing voices behind the characters. Former U-KISS member Kevin Woo (케빈/우성현) lends his vocals to Mystery of the Saja Boys and has been teasing fans for some time about cosplaying as the character.
True to his word, the idol recently unveiled his costume on Instagram, crediting content creator and cosplayer Lena Lemon for helping bring the look to life. That’s not all, apparently, the singer attended a fan meet event in Los Angeles as the character, where he was also joined by Mystery Saja’s voice actor. Here’s the full story:


Kevin Woo made headlines yesterday (Monday, 4th August) after hosting a pop-up fan meet event in Los Angeles, where hundreds of fans had the chance to meet him in full costume as his character, Mystery Saja. Attendees also took part in the viral “Soda Pop” dance challenge.
“It’s a testament to how popular ‘K-pop Demon Hunters’ is—it’s a worldwide smash hit. I’ve seen kids lined up with their families here, it’s been a great time,” he told ABC7 News. Joining Kevin at the event was a very special guest: Alan Lee, the voice actor behind Mystery Saja in the animated film. The duo’s appearance delighted fans who got to see both the singing and speaking voices of the beloved character in one place.

“I had the honour of attending Kevin Woo’s fan event!! It was a pleasure to meet so many fans and my own Mystery Saja’s singing voice counterpart!!” Alan wrote in his Twitter post. Fans online expressed their excitement over the duo’s appearance, with many sharing clips and photos from the event. Even the film’s director, Maggie Kang, joined in, commenting on how adorable the two were posing with fans together.
Here’s Kevin Woo’s cosplay reveal:
The reported fan meet event on ABC7: