"However, the Mirror of the Sage is missing a corner, and now shaking it might not necessarily bring forth the person you need," Yan Wu said.
"How do you use it?"
"Just write the name of the person you want to consult on the back of the mirror with your finger, then flip the mirror over, place it in front of you, and ask your question."
Ma Lu did as the hardware store owner taught, writing the name of Hua Tuo, then turned the mirror over and asked, "How do you treat a headache?"
Moments later, the mirror emitted a dazzling white light.
Ma Lu instinctively closed his eyes, and when he opened them again, the glow from the mirror had dimmed, revealing a middle-aged man with a lean face, not tall, a thick beard, sharp eyes like daggers, and wearing a traditional Chinese long gown.
He said indifferently, "Studying medicine won't save the Chinese."
After saying that, he vanished from the mirror.
Eh, how did I summon him?