McDonald's

I have to give it a 1-star because I got some chicken burgers (McCrispy) where something in it tasted like mold. I'm 100% sure it was mold, because it's not the first time I tastes it in Korea. Usually bananas and other fruits from convenience stores or marts tastes like this, too. But I never expected to eat mold from McDonalds. I'm extremely disappointed and angry about it.