A martial-arts master who forced his way on to a flight at Chek Lap Kok airport was sent to a mental hospital by a magistrate yesterday. Kim Jingho, 30, an American of Korean origin, pleaded guilty in Tsuen Wan Court to one count of entering a restricted area without a permit. Magistrate Allan Wyeth ordered him remanded in Siu Lam psychiatric centre for two months. Kim, a taekwondo trainer in the United States, passed unchallenged through security and boarded a Singapore Airlines flight to San Francisco on July 15. He entered the boarding hall through a security door and slipped past the immigration counters, the court heard. Kim took a seat after boarding the flight and refused to leave. A police officer eventually escorted him from the aircraft. No immigration officer saw Kim pass the security checks. Evidence was collected from surveillance video footage. Roderick Wu, defending Kim, said his client was a manic-depressive. 'His mind was not in a healthy condition at the time - that is why he did this stupid action. I hope Your Honour could give him a chance to receive medical treatment here. He is on his way to full recovery,' he said. Mr Wu said after the hearing that Kim came to the SAR as a tourist. He had migrated from South Korea to the US at the age of four and had completed a university course. Kim's family in the US had been notified and were co-operating with Siu Lam officers, Mr Wu said. The US Consulate had promised to arrange an air ticket for Kim to return to the US after treatment, he said.