Actor and singer Park Yu-chun of boy band JYJ on Friday was discharged from nearly two years of mandatory military service.Park was discharged late Friday from the Gangnam District Office in southern Seoul, where he served as a public worker in substitution for his military service. All able-bodied South Korean men between the ages of 18 and 35 must serve in the military for about two years, as the country remains technically at war with North Korea. Park Yu-chun (Yonhap)While serving his duty,