A MAN who posed as a nurse's friend to trick her out of $400,000 was jailed for three years yesterday. The District Court heard nurse Siu Wai-man, 36, received a telephone call and thought the caller was Dr Poon Tak-sum who had been in the United States for a year. Wu Lai-tong pretended to be Dr Poon but said he was now a businessman. In later calls to Ms Siu he claimed his cousin was a share-broker and that he could invest in the stock market for her. Wu gave his own name and bank account number to Ms Siu, saying it was his cousin's. Ms Siu made four transfers totalling $641,000 into Wu's account, but she realised she had been tricked only when the real Dr Poon returned from the US and telephoned her. Wu, 40, pleaded not guilty to four counts of procuring the making of an entry in a record of a bank by deception but was convicted by Deputy Judge Candy. The judge said he did not understand why Ms Siu could be so naive and foolish. He added that when she needed money, $230,000 was returned to reassure her. In mitigation, defence counsel Juliana Chow said when Wu was on bail for the case, he had been held in custody for two years without trial in China on a separate matter. He returned to Hong Kong in January.