Actor�Joo Won confessed that he gets stressed out by the weekly quizzes on '1 Night 2 Days'.

During a recent interview, Joo Won said, "When we're told that we're gonna have a quiz during filming, I get annoyed. I get scared, and I don't want to do it. I'm not joking, but when I solve quizzes, I can't remember what I know and stuff I don't know gets even more confusing. To be completely honest, I lack common sense, but I want to edit it all out."

He explained he was so worried because of what his parents might think, saying, "People think I'm like Lee Seung Gi, but I'm worried because I'm lacking [in a lot of ways]. I feel sorry to my parents because they might get disappointed thinking that I don't have common sense. Still, I study by reading books every day. I forget quickly even if I memorize it, but I should be able to remember something later, right?"

In other news, Joo Won has been cast in the upcoming film 'Only You'. He'll also be returning to musicals after four years with 'Ghost' in November.