I don’t know the allusion.
Is this sentence easy to explain? "Mian" refers to the face. Peach and plum trees are beautiful and lush. They are often used to describe beautiful women. Mianruo peach and plum literally means that the face looks like peach and plum trees. Flowers are as plump and beautiful, which actually refers to being beautiful; snakes and scorpions are often highly poisonous and can cause death, so they are often used as a metaphor for a vicious heart. The ancient Chinese believed that the main body of thought activity is in the heart rather than the brain. So the heart is like a snake and a scorpion, which means that the mind is as vicious as a snake or a scorpion, causing death.