In the laboratory, an old man with a white beard and a bald head was tinkering with something.
"Hey, Dr. Qi, your time machine isn't ready yet! We've been waiting for a week." Yang Sijie complained.
Yang Xinyan sat up from the chair and said seriously: "You are not lying to us, are you?"
Hu Menglin glanced at Dr. Qi, then turned to look at Yang Sijie and Yang Xinyan, and said jokingly: "Look! He doesn't know how to make a time machine at all. After all, a machine that can reach the speed of light hasn't been invented yet!"