Ghost in 掌心 MV?

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How many of you have heard of this? A 'ghost' was sighted in 掌心 MV by 無印良品. Was it real or jus a hoax so as to promote their new album then?
hint: The 'ghost' appeared at e same spot THROUGHOUT the MV. Pay attention to the chorus whereby behind Guang liang and Pin guan is an old abandoned building. o_O