The original poster is not wrong, buying on the exchange is 606,548 RMB for one BTC, then selling one BTC on C2C is 612,022 RMB, with a difference of 6,000 RMB in between. A net profit. But if you put 600,000 into Alipay, it will probably be frozen immediately. Original poster, would you dare to put 600,000 into Alipay at once?