What is the black history you want to delete most?

Everyone has a happy childhood. When I was in primary school, I didn't know there was a kind of medicine wrapped in paper, like headache powder. The picture on it is very beautiful. There is an immortal old man in the painting, who feels like a legendary fairy. I shared with my classmates how many bags I ate, saying that I could become immortal after eating them. As a result, I became dizzy after eating it. After the teacher found out, he immediately sent us to the hospital for examination. There were also some paper-wrapped medicines that had not been eaten in the bag.