An information technology student who helped a baker produce a letter to blackmail a flour company for $2 million was jailed for 16 months yesterday. Chang Ho-lun, 21, typed and printed the anonymous letter, warning the company that caustic soda would be added to its breads and its delivery trucks damaged unless the money was paid. He pleaded guilty to blackmail last month. Chang's friend, Wong Kwun-ngai, worked at the wholesale baker and is serving a five-year sentence for blackmail. The offence, committed last September, was a serious one, Judge Mary Yuen Lai-wah said in the District Court yesterday when passing sentence. The bakery owed money to a flour company which took it over and then sacked Wong and many of his colleagues. The court heard Chang and Wong produced the blackmail letter together. Judge Yuen said Chang had failed to uphold the virtues and civic responsibility society expected of a university student. But in mitigation, barrister Albert Luk Wai-hung said Chang was a good student with admission offers from two universities. He said Baptist University had also offered Chang a place in its master of business administration programme. He told the judge Chang was of good character but had been simple-minded enough to offer to help Wong by typing the letter. The judge reminded Chang to make good use of the time in jail to better his studies.