The game boasts an Auction House, a welcome feature in more of the recent games, and completely eliminated the vending system. You're given the choice of selling your wares to the NPC (for a cheap price), selling it in the auction house, or peddling it across maps (which is a chore). The auction house is sorted according to armor or weapon type, and you can narrow your search by selecting a specific class, level range and gender. Depending on the current market flow, your searches will sometimes end up with a list filled with female or male-exclusive sets. 

Your inventory is pretty much a simple interface, much like Ragnarok Online or Perfect World's inventory window. The window displays your equipped items, and the inventory slots below. The inventory is sorted into Normal and External tabs. Normal tab stores your general loots, trash drops, sowels, pots etc. An interesting thing to note here is that your gold/money earnings take up 1 slot of the inventory. The External tab stores weapons and armors that you've acquired. Weight capacity is seen in your HUD, just below the HP and MP bar, fairly easy to miss.

A nice feature in Asda is the Sowel item. They're basically gems that you can insert into your weapon or armor slots. However, unlike the usual permanence in socketable items we've seen like in the Diablo series, Sowels are pretty much replaceable like bullets to a gun. You can exchange your the sowel in your armor or weapon for a new and stronger sowel. Sowels can offer additional attack or stat bonuses aside from the weapon/armor bonuses provided.

Two other features of Asda is the Soulmate system and the use of titles.
The former offers additional skills and certain stat or exp bonuses whenever you and your assigned soulmate is within a near range or in a party. Like you, your soulmate status also levels up, automatically unlocking more skills like healing your soulmate, giving extra buffs, teleporting to your mate's location, or reviving a fallen soulmate.
The latter, titles feature, is a means to give players a sidequest. Titles, as the name suggests, give your character a certain "title" above your name. There are more than 50 titles to acquire, mix and match (example is "Boring Newbie"), with an ingame ranking system that tells who has discovered the most titles so far. 

Since it is f2p, Asda Story has an Item Mall, in which you can spend "campus cash" for certain time-limited mounts/rides, some potions and scrolls, and a number of new hairstyles. Thankfully, the item mall doesn't have items that somehow "compel" you to buy in order to gain an edge in-game, like time-limited epic weapons or armors.