Why is Yu called poison?

Yu is called a poisonous son because his parents sell drugs. The second generation of "poison" was exposed in a large idol talent show. According to speculation, this player named Yu is a C-level player deeply loved by the audience. He is from Canada and his parents are from China. Due to superior family conditions, Yu has always appeared on the stage as a young master. After being exposed by netizens, the personal background of parents was exposed. The other party is a businessman, who runs several KTV's, but it is not formal. In the recruitment profile, he openly recruited "Jiali" (a woman with a special occupation). Just when everyone thought that Yu's parents were involved in pornography, the other party was exposed that the KTV they operated was exposed to buying and selling Du, which was proved by the verdict and later called poison by netizens.