That night, the Su family invited the old Dr. Chen to their home.
"Neixi?"
The old Dr. Chen was stunned upon hearing the word.
"Yes. Dr. Wang said so."
Song Ruiping was still worried about the so-called neixi in her daughter's body, so she invited the old Dr. Chen over.
"Do you know about this?"
"How could I not know? Don't novels and movies have it?" the old man replied with a smile.
"I'm not talking about that."
"I know. Actually, this thing really exists," the old Dr. Chen answered after pondering for a while.
"It exists? Have you seen it before?"
"Yes."
"What's the function of neixi?"
"It depends on the type. Some can increase your strength, whereas some can improve your body's immunity system. However, some are harmful," the old Dr. Chen explained.
"It's harmful as well?"
