Twice I cant stop me but read the description
When Nayeon sings it gets deformed
When Mina sing it gets mirror
When Sana sings - the mv changes to more & more
When chaeyoung sings - it gets kaleidoscope
When jeongyeon sings - its normal
When jihyo sings - it gets mirror sideways
When momo sings - its get bass boosted
When Dahyun sing - it gets faster
When tzuyu sings - it gets slower