Today, I will share with everyone a secret of buying and selling friends on Kaixin001, a method that can make more money than just buying and selling. You may feel curious about this, but there is nothing strange. Let me explain: Use your main account to send invitations, and create 10 male sub-accounts. Once they are invited, buy them as slaves. Keep doing this until you finish buying. You earn 500 system rewards for each invitation, and the price for buying a male slave is also 500. So in the end, you haven't touched your initial capital.