A student who left behind his wallet with his ID card after beating and robbing a 17-year-old prostitute was yesterday sentenced to 41/2 years in prison. Wong Chun-hang, 19, had earlier pleaded guilty in the Court of First Instance to one count of robbery and one count of violating the terms of his probation. The court heard that Wong arranged to meet the girl in August, when he was in Form Six, at Prince Edward MTR station. After agreeing on a price of $1,000 for sex, they went to the Park Excellent Hotel in Portland Street, Mongkok. Once in a room at the hotel, Wong gave the girl two $500 notes, which she put in her bag before going for a shower. However, while she was showering, Wong entered the bathroom carrying a paper cutter and a roll of adhesive tape. He forced her to the ground and attempted to hold her down, but she struggled and bit him on the arm, elbow and leg. When the cutter broke during the struggle, Wong resorted to using his fists, punching the girl in the back of the head, and then struck her head twice against a wall. He covered her mouth, and bound her arms and legs with the adhesive tape before rifling through her bag. He returned to the bathroom and punched the girl again before leaving the hotel room. But in his haste, he left behind a wallet containing his ID card. Wong returned to the room a short time later to find the prostitute in the company of a hotel staff member. He apologised and begged her not to call police, fleeing when she screamed for help. When Wong again tried to retrieve his wallet later that day, he was arrested by police as he entered the hotel. He told officers he had tied up the girl as part of a bondage game and that he wanted to take back the $1,000 he gave her because they did not have sex. The victim was taken to hospital and found to have bruising and light abrasions on her scalp. Wong, whose fellow students were in court to watch the sentencing, said through his lawyers that he had planned the robbery as he was concerned about being looked down upon by his relatively more affluent school mates. His father, who had an eye ailment, was unable to obtain anything more than casual building work and brought home about $7,000 a month. Mr Justice Peter Line said that did not amount to anything by way of mitigation for such a serious and violent crime, and sentenced Wong to 41/2 years behind bars.