"Brooch" This item want to resize.
You can see more item include name "Brooch". Select one you want to change click "SPR" this will showing "Korean Spite Name".
Copy "Korean name" and search in GRF Editor
Search Item in GRF Editor
This one you want to resize and extract to folder and resize by Photo Editor
Open that image and resize it. approximate maximum one size 50 - 80 pixel.
Resize then click "OK" and save it.
Open GRF Editor and replace sprite your edit.
Click save step 1 and step 2
If you can't save "DATA.GRF" or something error when saving, don't forgot windows system need more permission when your game folder in drive "C".
need open GRF Editor with administrator mode (right click GRF Editor, select run as administrator). This mode may you can't drag and drop file to GRF Editor.