Shiba Inu (SHIB) surged 28% last week before sellers rejected the rally at $0.00000548. The token jumped about 36 percent to $0.0000057 on Sunday, adding roughly $1 billion in market value in a day without any clear fundamental catalyst. South Korean traders on Upbit, where the SHIB/KRW pair accounts for more than a tenth of global volume and trades at a slight premium, appear to be driving the move.