An audience member told Ilgan Sports, "Before you go in, you sign an oath. When you get there, the staff give out papers that read that you won't share the broadcast on SNS or blogs. If you break the oath, you have to pay them an entire episode's production costs."

The audience member added, "You can take your cell phones, but they give out stickers to cover your cameras to prevent you from taking pictures. Since the staff take so much caution against spoilers, the audience doesn't really try to take pictures or anything."

It was also revealed that 'Mask King' filmed for about 8 hours, starting at 4PM and lasting until midnight. Both the audience and celebrity panel are given about 10 minutes of break each.