Downstairs, Nian Junting called Doctor Han. "My girlfriend is on her period, and she's being unreasonably mad at me the whole time. What should I do?"
Doctor Han responded, "Eh… I'm a doctor, not a women's studies specialist. Did you do something that made her angry?"
"No."
"Is she having a stomachache? Is she in a bad mood?" asked Doctor Han.
"I only know that she's feeling uncomfortable. Also, her period started earlier than normal."
"Maybe she has endocrine dysfunction. I heard that women with endocrine dysfunction can be short-tempered and moody."
"That's possible." Nian Junting nodded. "How do you fix that?"