The Drop System is the manner in which items from monsters are randomly "dropped" when that monster is killed. Each monster has a maximum of 10 items in their "Drop Table" which they can drop. Each item has separate rate at which it is dropped. For example, a card may drop at a rate of 0.35% but a more common item such as an Apple may have a drop rate of 100%. Several factors affect the rate at which items are dropped: Base drop rate of the item from that monster, server drop rates and the use of any items or skills by the player that affect drop rates (Cards, Bubble Gum, etc.).
When a monster is killed, the person who did the most damage to that monster has priority over others to pick up any items that dropped from it. For a period of time, only that player can pick up the items.
When in a Party using the item share option, items are distributed to all players in the party regardless of who picks them up, although the players doing the most damage to the monsters will get items more often than those who aren't. (Example: Player A picks up an item, but it is added to Player B's inventory).