on load:

    set {class::brewer::iron_helmet} to unbreakable iron helmet named "&d[브루어] &b철모" with lore "&7브루어를 지켜줄  방어수단입니다." and "&7방어력: &a+2" and "" and "&7부가 효과: &c체력 감소 +2" with attributes flag hidden with hi dden unbreakable flag

on player armor change:

    if new armor item is {class::brewer::iron_helmet}:

        execute console command "attribute %player% minecraft:generic.max_health modifier add 0-0-0-0-2 brewer_helmet -2 add"

    if old armor item is {class::brewer::iron_helmet}:

        execute console command "attribute %player% minecraft:generic.max_health modifier remove 0-0-0-0-2"

        heal the player

원래 코드대로라면 철 헬멧을 입었을 때 체력이 18로 바뀌고 다시 해제하면 체력이 20으로 바뀌며 체력이 회복되어야 하는데 회복되지 않습니다.