After Rebirth, My Junior Sister and I Exchanged Strange Fires

On the day I chose the strange fire, I took the initiative to snatch the low-grade yellow flame from my junior sister and gave her the glazed pure fire given by the headmaster. The master hit me on the head with the alchemy stove: "Have you taken the Pill of Jiangzhi? The Glazed Pure Fire is a superior fire, and the yellow flame you got in exchange is not even as good as the stove fire in our small courtyard!" I thought for a moment, "I have to examine myself three times in a day, I am not wrong!" In the previous life, I regarded the colored glaze as a treasure, but he and his junior sister made me explode, disfigured, disabled, and became a useless person. In this life, I must lock these two bitches to death.