On the September 16 installment of 'Knowing Brothers', Jinyoung asked, "What did Sandeul and I suffer 5 times constantly in a music show waiting room?" After a lot of wrong guesses by the 'Knowing Brothers' cast members, he finally said, "We experienced sleep paralysis."
He continued, "We were so tired that we fell asleep in the waiting room of a music show. Sandeul and I slept with our heads near each other, but my body suddenly couldn't move. I managed to get up, and I noticed Sandeul was having a hard time getting up too. After that happened, we decided to wake each other up if it seems like we're going through sleep paralysis."
Jinyoung added, "Sandeul saw that I was suffering, so he woke me up. Just like that, Sandeul and I suffered sleep paralysis 5 times. The last time, I opened my eyes a little and saw that a ghost was holding up a big mirror and reflecting me in it. It wanted to show me how much I was suffering."
Sandeul then commented, "I was shocked at the time, so now I always refer to it with respect as Sir Ghost."