Secret's Sunhwa and After School's Jooyeon held a battle of the 'blank paper brains' on an episode of KBS 2TV's "Invincible Youth." Sunhwa is already known for her 'blanket paper' character on the show, while Jooyeon recently earned the nickname of 'burden Jooyeon' for not being good at particularly anything. In order to prove that she didn't deserve her nickname, Jooyeon declared a battle of four-lettered Chinese characters and ended up doing worse than she intended. When asked to match the four-lettered Chinese characters to the proverb, "To quarrel over right and wrong," Sori guessed the correct answer to be, "????." Juyeon then chirped in by asking, "Isn't that slang?", causing the other members to burst out in laughter. When asked to match the four-lettered Chinese characters to the proverb, "The coincidence of having two events happen at the same time," Sunhwa and Juyeon both gave the wrong answers by confidently stating, 'oh bi bae rak' and 'oh bi bi rak', when the correct answer is actually, '????.' Feeling the need to better educate themselves, the members went up to the camera and promised, "We will study properly and battle again." The episode will broadcast on December 3rd at 11:05 PM. Source: Sports Chosun via Nate