TWO men were jailed yesterday for falsely imprisoning a teenage girl and her friend out of misguided loyalty. Wong Hoi-wai, 22, and Koon Yuk-lan, 20, were found guilty of two counts of false imprisonment. They were accused of imprisoning Cheng Ngan-mui, then 18, and detaining her against her will between January 5 and 7 last year. The prosecution alleged the pair also detained Ng Yau-cheung, 20, against his will between January 6 and 7. Wong Hoi-wai's brother, Wong Hoi-ming, then 19, who faced two similar charges, had jumped bail on the first day of the trial. Wong Hoi-wai was also found guilty of blackmail. Judge Chua jailed Wong Hoi-wai for five months and Koon for four months. She said the defendants had committed the offences out of misguided loyalty in an attempt to persuade Wong Hoi-ming's former girlfriend to stay with him. Although the victims had been treated civilly by the defendants, Judge Chua did not consider it appropriate for her to pass a suspended sentence as their counsel, Michael Ko, had submitted. Prosecuting counsel Andrew Chung told the District Court that Ms Cheng was taken to a Mongkok restaurant by taxi, after being stopped by Wong Hoi-ming and an unknown man. In the restaurant, Wong Hoi-ming asked Ms Cheng the whereabouts of her new boyfriend, but she refused to answer. The two Wongs and the unknown man later took the girl to a Mongkok flat, the court was told, and she was allegedly assaulted by Wong Hoi-ming and locked in a room guarded by him and Koon. The next day, the three defendants took Ms Cheng to her Tuen Mun home, where they met her friend, Mr Ng. The court heard that he was assaulted by Wong Hoi-ming, who mistook him for Ms Cheng's new boyfriend. He was held in a bedroom with the girl after he paged Lam King-wah, 19, a co-tenant of Ms Cheng. Mr Lam later arranged to meet Wong Hoi-ming in Tsim Sha Tsui and reported the matter to police. The defendants were arrested on January 7 last year, after the Wongs threatened to chop Mr Lam unless he paid them $10,000.