The chaotic recording session of the Shownu and Hyungwon unit and Hyoyeon's featuring.

Singing high notes while wearing acupressure slippers in the recording studio or trying to match 10% humidity

The detailed setting of actually spraying with a spray bottle was amazing.

But when it comes to the ad-lib recording, they add excessive vibrato, claiming it's the Billboard style.

The scene that I remember the most is when Hyungwon gets flustered and asks to remove 99%.