A hotel security guard yesterday admitted blackmailing Jusco's Kornhill store for $4 million with a bomb threat, but said he only did it for fun. Wong Chi-wai, 45, made threatening phone calls from the Mandarin Oriental Hotel where he was working on May 6 this year, the District Court heard. Defence lawyer Edmond Lam Yau-yee said Wong made the hoax calls to amuse himself and never intended to collect the money. 'He felt life was very boring and needed some form of stimulus. He did it just for fun,' Mr Lam said. The defendant had reduced his demand from $4 million to $200,000 to ensure the department store would not believe it was a practical joke. 'He reduced the sum to make it look more realistic and wanted to make sure the victim company made a report to the police.' Prosecutor Gary Lam Kar-yan said the defendant called Jusco at Kornhill and demanded $4 million, threatening to plant bombs at every Jusco store if he was ignored. The threats were reported to the police. Later that day, Wong called again and spoke to a police sergeant posing as the store manager. Wong reduced his demand to $200,000 and said the money should be put in a flowerpot in the Mandarin Oriental lobby at 4pm that day. Police arrested him the next day after matching the phone calls made from the hotel with those received by Jusco. Under caution, Wong told police he was driven to commit the crime because he needed money to repay his debts. The prosecutor yesterday conceded that the defendant had credit card debts of $30,000, but said he could repay them in monthly installments. Judge Bernard Whaley asked for psychiatric reports and adjourned sentencing until July 27. Wong was remanded in custody.