By Ko Dong-hwan K-pop duo band Akdong Musician’s composer and singer Lee Chan-hyuk, often regarded as a musical prodigy has enlisted in the country’s Marine Corps. The star, 21, who plays with his younger sister Su-hyun, voluntarily entered a training centre in Pohang, North Gyeongsang Province. He kept his enlistment quiet from the public as his Christian pastor parents, a few close friends and staff from his agency YG Entertainment saw him enter the military world for…