Mark expected the system to answer him like its proposal was fair and the money he paid to acquire the item was actually covered by selling the system's items to others by using a loophole; however, it readily accepted the negotiation.
*Ding! The host's counteroffer is accepted. Now, please proceed to submit the item.
Mark's eyes widened by the notification, "seriously? My hypothesis is true then. It was for this key."
He doesn't know what the system wants, but since he only profited that night, Mark submitted the box to the system. In return, the system sent him a notification.
*Ding! The quest has been completed. Please click to receive the rewards.
Mark clicked on the notification.
*Ding! Rare material purchase section has been unlocked in the store.
*Ding! Voidstone has been unlocked. Please check the Rare material purchase.