By Park Chung-a Staff Reporter Singers who are ordered to join the army again have launched their legal battle against the Military Manpower Administration. After the singer Psy filed an administrative lawsuit against the office Friday, other pop singers, like Lee Jae-jin and Kang Hyun-soo, are also preparing to take legal action. The three singers were ordered to join the army again as they were found to have neglected their duty by working instead at high-tech companies in Seoul where employees are exempt from the country's mandatory military service. The singers have claimed their innocence and pointed out that MMA is responsible for making the wrong decision. Korea imposes all able-bodied men to serve in the military for at least two years, but technology researchers and professionally skilled workers with special expertise are exempt from this rule, fulfilling alternate obligations in companies that serve vital national interests. The 30-year-old Park Jae-sang, better known as Psy, has been ordered to begin his military service from August, at the earliest. ``With my certificate which I legally acquired, I worked diligently during my working hours. I can never feel right about myself if I accept the MMA's order to rejoin the army without being able to say `no' to what is not right even though I have not committed a crime," wrote the dance singer Psy on his official Web site. ``I want to get myself cleared by proving my innocence despite difficulties, in order to become a respectable father to my twins who will be born soon.'' Psy not only filed an administrative lawsuit, but also requested the court stop the MMA's execution of his re-enlistment to the army. Spokesman for singer Lee Jae-jin, a member of the now disbanded boy band Sechskies, said that he did not neglect his duties during the employment period. ``Lee has been working earnestly as a technician. While he was working, MMA officials would visit Lee's office for inspection two to three times a month and say that there was nothing wrong with Lee's working attitude. However, it has suddenly changed its position,'' said the spokesman. ``If Lee rejoins the army, it is as if acknowledging that he has done something wrong. It is unjust for him to get maltreated just because he is an entertainer. The aim for filing the administrative lawsuit is to prove that Lee has been faithful in his duty,'' he said. Singer Kang Hyun-soo, 27, who was also ordered to rejoin the army in late August, blamed the MMA for its decision. ``Although Kang worked hard, he was laid off due to the company's financial problems. Kang reported this to the MMA and looked for a new company during three months. However, during the period, he was summoned by the prosecution and ordered to reenter the army, out of the blue,'' said Kang's spokesman. ``MMA is responsible for its lack of thorough inspection over Kang's working record.'' michelle@koreatimes.co.kr