My father saved someone's life, but was blackmailed instead.
Seven-year-old Ye Qiu clenched his fists and asked his grandfather: Are you so useless as a doctor?
Grandpa dragged out an old wooden box from under the bed. Inside was a set of blackened military medals and nine silver needles.
"Your father saved a person, but grandpa saved an ordinary person in North Korea. If you want to learn, just learn from grandpa - be a military doctor of a great country and treat thousands of troops. Who dares to blackmail you?"
Three generations of practicing medicine, passed down by one needle. From the valleys of northwest Hubei to the battlefields of the War to Resist U. S. Aggression and Aid Korea, from barefoot doctors to military medical legends.
This needle, when inserted, saves life and upholds soul.
Very good, no typos and the meaning is clear.