A man who tied up and robbed a hotel worker, but was tracked by police because he registered in his own name, was jailed for 4? years yesterday. Chan Kwong-ming, 20, pleaded guilty to one count of robbery before Mr Justice Thomas Gall in the Court of First Instance on May 13 but sentencing was adjourned for background reports. Yesterday, the court heard Chan had a troubled childhood and had spent eight of the past nine years in detention. Eventually he fell in with triads. 'Unless you change your mind about associating with people like that, you will continue to get into trouble,' Mr Justice Gall told him. But he also said he did not see the link between Chan's present crime and his personal history. The court was told Chan checked into the Fu Shing Hotel in Mongkok on February 18 last year, using his own name and identity card. He paid $180 to stay one night in a single room. When nightshift worker Chiu Kam-heung, 48, turned up for work, she heard the sound of breaking glass from Chan's room and helped tidy it up. Later, Chan came out of his room wielding a shard of glass, which he pressed against Ms Chiu's cheek, causing a small cut. After robbing her of $1,000, he pushed her into his room and tied her up. He then fled but was later tracked down by police.