A laid-off worker was yesterday jailed for 20 months for stabbing a former boss in the face after trailing him for five hours to demand he settle a $110,000 payment. Ng Wai-on, 52, pleaded guilty in the District Court to one count of wounding with intent. Prosecutor Michael Wong Kin-bong said Ng had worked at a factory run by Lam Hoi-ting, 61, for more than 20 years. Mr Lam closed his business in 1999 and owed Ng about $110,000 for long service. Ng lost contact with Mr Lam until he saw him on January 5 this year on a train. When Ng asked his former boss to pay him, Mr Lam said he had no money and asked him to file a claim with the Labour Department. The two went to a Mongkok coffee shop to negotiate but failed to reach agreement. Ng then followed Mr Lam and bought a paper cutter, Mr Wong said. Five hours later at about 10pm, the two got into an argument. The court heard Ng punched Mr Lam several times in the face and stabbed him with the paper cutter before fleeing. Mr Lam was sent to Kwong Wah Hospital with six cuts to his face and one on his left arm. Ng was arrested at his Kam Tin home. Defence solicitor Raymond Ng Chi-hin said Ng tried to deal with the matter in a peaceful way but lost his patience. He said Ng offered to take only half the payment but Mr Lam refused. Judge Wesley Wong Wing-fai said Ng should have dealt with the matter in a civilised way.