First Aid Bandage (Hangul: 반창고) or Adhesive bandage is a scrapped/removed health recovery item in the final.
It cannot be found in any buildings and must be spawn through command. It is presume that it was supposed to be found in more areas in all buildings. Since it has no effects, it is possible that it recovers 10% of the player's health.
Oddly, it uses the icon of a key. It is possible that it uses it as a placeholder or this item was originally a key at some point but was scrapped.