Classic question: When I wake up and find myself in a mental hospital, how can I prove that I am not a mental patient?
Before time travel, Tang Qian: Whoever proves this has a flaw in his head.
After time travel, Tang Qian: Doctor! Doctor! Look, I can do push-ups. I'm not a psycho!
The doctor's face was full of kindness: "Yeah, I know you are not. How about taking medicine first."
Xie Huanian: Who has a trick in the brain?
Tang Qian accepted, Xie Huanian attacked
Purpose: World peace