0829 도전과 응전 BSBC 2021.08.29 13:22 https://www.youtube.com/watch?v=IKYqgTEra-Y + 476 https://www.youtube.com/channel/UCcNAi0Cztgxw3fWgbfTdwrw/videos + 513 0829 도전과 응전