Original source: NAVER tv cast
tenshi_akuma’s note: Alkkagi (알까기) is a new playing style of traditional Korean board game, Baduk. Players place seven pieces of their corresponding color onto a grid and take turns flicking their pieces to knock their opponent’s pieces off. Whoever first eliminates all of the other team’s baduk stones first is the winner.
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Reference 1: For those who love South Korea
Reference 2: http://bigbangupdates.com/2016/03/g-dragons-instagram-update-160325-video.html