Why is only Girls' Generation doing a lip sink? The Q sheet of Summer Festival was leaked out and became a hot issue.

The Q sheet of '2015 Ulsan Summer Festival' was leaked out, and became a hot issue in a Korean online community.

Netizens who saw the Q sheet had reactions like,
"Why is only Girls' Generation doing a lip sink while everyone - A pink, SISTAR, INFINITE, BEAST - is doing a live?'
'Isn't doing Live MR (Recording the song like a live and doing a lip sink in the actual broadcast)
not AR (All Recording, lip sink to the CD sound source) like fooling the audience?'
and 'Girls' Generation seems not to do live in music broadcasts these days...'

(MR:Music Recording)
▲Image Source: Online Community