Calls are mounting within South Korea for members of megaband BTS to be granted alternatives or delays to mandatory military service, with some lawmakers and fans arguing they are doing plenty for their country without wearing a soldier's uniform.

By law, all able-bodied men in South Korea aged between 18 and 28 must serve in the military for roughly two years as part of the country's defences against North Korea.

The eldest member of the band, Jin, is 27 and will be required to sign up by the end of next year while the other six will reach the age of conscription over the next few years.