This master Zhang encountered a bad thing that he will never forget, because he helped the customer unlock, the finger that ate by handicraft was cut off with a knife, and because of the serious injury, not only could not take care of himself, but also fell into a great psychological shadow.
Just because of opening a lock, why can the finger be cut off? This sounds surprising, what happened, things have to start from the beginning.

Master Zhang is an honest locksmith, who originally relied on his superb lock opening skills to live a practical and satisfying little life.
In the early morning of the day of the incident, I was still asleep at home, and I was suddenly woken up by a series of phone calls.
After Master Zhang connected, he found that the other party was an old customer of his, Ms. Qin, because this customer often forgot to bring the key when he went out before, and every time Master Zhang went to help unlock the lock, so the two became acquainted.
Since the phone call was received in the early morning, Master Zhang was worried that Ms. Qin would not be able to return home by herself locked out of the door, so she quickly got up and put on her clothes, took the toolbox and went out. However, the location of this unlocking was not Where Ms. Qin had lived before, and Master Zhang couldn't help but wonder.
So Master Zhang asked whether the house was her own, Ms. Qin said that it was her own house, because the key fell in front of the house, so she could not get into Master Zhang's doubts and asked many times in a row, Ms. Qin's attitude was resolute and affirmative and especially urgent to urge Master Zhang to quickly open the lock. Master Zhang took the toolbox and opened the door cleanly and neatly, and then joked to Ms. Qin that he was skilled in unlocking the lock. But just as he bent down to pack up his tools, an unexpected scene occurred.
"It was just that the door was opened, and the knife came out, and I just used my hand to block it, trying to block the knife like this." Then I ran downstairs and looked, and almost all my fingers were bone-in.2 The unarmed Master Zhang reflexively blocked it with both hands, did not even take the toolbox, and ran downstairs in panic.
When Master Zhang ran downstairs and found that the knife holder had not followed him, he was relieved to rest, when he suddenly found that his fingers had been cut off and the blood was flowing.
"At first, I didn't feel it, and when I ran to the stairwell, the blood couldn't be stopped. At that time, the security guard used a charger to help me tie up and stop the bleeding. ”