Kang Si-ha/System

Kang si-ha's ability/status window.

If he think about the status window/quest window and many more functions they appear in front of his eyes and they disappear in the same manner.

When he kills monsters he gets experience and money.

Inventory
The system ha a limited inventory system(ch.3 It was a glass window with alternating vertical and horizontal lines. Like a checkerboard, it had three vertical and three horizontal columns.). the inventory space can expand upon evolution.(may be because of leveling milestones, edit if i am wrong)

When he wants to use items he just needs to think about the inventory and reach in with his hand and pull it out.

When a monster gets killed by him, even if he does not pick up the loot every thing will still end up in his inventory after a set amount of time.