An amateur way to find out if ayu lip-syncs

[noidea]

I think she sang live, she was off in some parts! they just cut out the breathing and(maybe) rerecorded 2 or 3 sentences and when watching and listening closely, you can also notice that her voice is sounding better in the parts where she isnt moving much(last bridge, beginning), im 94% sure its live(not 100%, she could have used a VERY, VERY authentic live playback though)
and about until that day..., i think it was live with heavy effects