First install these 2 Systems:

https://www.elitepvpers.com/forum/metin2-pserver-guides-strategies/3994360-rls-markierung-neu-gedroppter-items.html

https://metin2.dev/board/index.php?/topic/15220-pyc-gf-like-inventory-slot-marking-system/

Defines to search for:

#define ENABLE_SPECIAL_INVENTORY
#define ENABLE_INVENTORY_SORT
#define HIGHLIGHT_SLOT
#define WJ_ENABLE_TRADABLE_ICON

Refine BYTE to WORD fix found by comment:

//190112 Sanii: